9+ Oval Diamond Ratio Calculator Tools & Charts


9+ Oval Diamond Ratio Calculator Tools & Charts

A tool designed for determining the proportions of an elongated, rounded shape, similar to a racetrack, frequently used in gemology and other fields requiring precise dimensional analysis of such forms. This typically involves inputting measurements like length and width to compute a ratio representing the degree of elongation. For example, a longer, narrower shape will have a higher ratio than one that is closer to a circle.

Accurate assessment of this proportional relationship is critical for gem cutting and setting, influencing both aesthetic appeal and structural integrity. Historically, such assessments relied on visual estimations and manual calculations. Modern digital tools offer greater precision and speed, allowing for more consistent results and facilitating complex designs. This capability streamlines workflows and enhances the ability to communicate precise specifications within these specialized industries.

This understanding of proportional relationships in elongated rounded shapes informs several related topics, including gemstone evaluation, jewelry design, and the development of computer-aided design (CAD) software for these applications. The following sections will explore these areas in greater detail.

1. Oval Shape Analysis

Oval shape analysis forms the foundation of an oval diamond ratio calculator’s functionality. This analysis quantifies the elongation of an oval, a critical factor in determining its aesthetic appeal and, consequently, its value. The process involves precise measurement of the oval’s length and width. This data serves as input for calculating the length-to-width ratio, a key metric in evaluating oval diamonds. For instance, a ratio of 1.50:1 indicates a longer, more slender oval compared to a ratio of 1.30:1, which represents a rounder shape. Understanding these variations is fundamental to appreciating how the calculator translates measurements into meaningful interpretations of oval proportions.

This analytical approach enables objective comparison and classification of ovals, moving beyond subjective visual assessments. A consistent methodology ensures uniformity in evaluating different stones. Consider two ovals with identical carat weights: one with a ratio of 1.60:1 and another with 1.40:1. The elongated shape of the former may appear larger, impacting perceived value, while the latter’s rounder profile offers a different aesthetic. The calculator facilitates these comparisons, offering a standardized method for quantifying these subtle yet significant differences. This provides a crucial tool for both professionals and consumers in the diamond trade.

In summary, oval shape analysis provides the necessary framework for the effective utilization of an oval diamond ratio calculator. It transforms raw measurements into actionable insights, aiding in standardized evaluation, informed decision-making, and ultimately, a deeper appreciation of the nuances of oval diamonds. This analytical rigor benefits all stakeholders in the gem and jewelry industry by providing a common language for describing and evaluating these elegant shapes, addressing the challenges of subjective interpretation and enhancing market transparency.

2. Diamond Proportions

Diamond proportions are integral to the functionality of an oval diamond ratio calculator. The calculator serves as a tool to quantify these proportions, specifically focusing on the length-to-width ratio. This ratio is a crucial determinant of an oval diamond’s appearance and, consequently, its value. Proportions influence brilliance, fire, and scintillationthe interplay of light that gives a diamond its characteristic sparkle. A well-proportioned oval maximizes light return, resulting in a lively, brilliant stone. Conversely, poorly proportioned ovals may appear dull or lifeless due to light leakage. For instance, an excessively long and narrow oval might exhibit a bow-tie effect, a darkened area across the center, diminishing its visual appeal. Conversely, an overly short and wide oval may appear less elegant and desirable.

Consider two oval diamonds of equal carat weight: one with proportions deemed ideal by industry standards (a ratio around 1.50:1), and another with less desirable proportions (a ratio of 1.70:1, excessively elongated). The ideally proportioned diamond will likely command a higher price due to its superior brilliance and aesthetic appeal. The elongated diamond, despite having the same carat weight, might be perceived as less valuable due to the undesirable bow-tie effect. This exemplifies the practical significance of understanding diamond proportions in the context of valuation and aesthetics. An oval diamond ratio calculator provides a quantifiable measure of these proportions, enabling objective comparisons and informed purchasing decisions.

In conclusion, diamond proportions, particularly the length-to-width ratio, are central to understanding and utilizing an oval diamond ratio calculator effectively. This ratio serves as a quantifiable metric reflecting the interplay of light and shape, directly impacting a diamond’s brilliance and overall aesthetic value. Utilizing the calculator facilitates objective assessment of these proportions, empowering both professionals and consumers in the diamond market to make informed choices based on established standards and desired aesthetic outcomes. This understanding fosters greater transparency and enables more confident navigation of the complexities inherent in evaluating and selecting oval diamonds.

3. Length-to-Width Ratio

The length-to-width ratio is the core function of an oval diamond ratio calculator. This ratio, calculated by dividing the length of the oval by its width, provides a numerical representation of the oval’s elongation. Understanding this ratio is fundamental to evaluating an oval diamond’s appearance and proportions, influencing its brilliance, fire, and overall aesthetic appeal. This section explores the multifaceted implications of this ratio.

  • Visual Perception of Shape

    The length-to-width ratio directly impacts how an oval diamond appears to the eye. A lower ratio, such as 1.30:1, results in a plumper, rounder oval, while a higher ratio, such as 1.60:1, creates a more elongated, slender appearance. Even subtle differences in this ratio can significantly alter the perceived shape, influencing personal preferences and design considerations. A ratio calculator provides a precise measure, enabling objective comparisons beyond subjective visual estimations.

  • Impact on Brilliance and Fire

    The length-to-width ratio plays a critical role in how light interacts with an oval diamond. Ratios considered ideal maximize light return, resulting in enhanced brilliance and fire. Deviations from these ideal proportions can lead to light leakage, diminishing the diamond’s sparkle. For example, an excessively high ratio might cause a bow-tie effect, a darkened area across the center of the stone. The ratio calculator aids in identifying proportions that optimize light performance.

  • Industry Standards and Valuation

    Established industry standards often define ideal length-to-width ratios for oval diamonds, typically falling within a specific range (e.g., 1.45:1 to 1.55:1). Diamonds adhering to these standards are often considered more desirable and command higher prices. A ratio calculator allows for quick assessment of a diamond’s adherence to these standards, providing valuable information for valuation and purchase decisions. This fosters market transparency by providing a quantifiable metric for evaluating oval diamond proportions.

  • Jewelry Design Considerations

    The length-to-width ratio is a crucial factor in jewelry design. The chosen ratio influences the overall aesthetic of a piece, impacting how the diamond interacts with other design elements. For example, a more elongated oval might be suited for a pendant, while a rounder oval might be preferable for a ring. The ratio calculator assists designers in selecting stones with proportions that complement the intended jewelry design, ensuring harmonious integration of elements.

In conclusion, the length-to-width ratio, calculated using an oval diamond ratio calculator, is not merely a numerical value; it is a critical factor influencing the visual appeal, light performance, market value, and design suitability of oval diamonds. Understanding the nuanced interplay of these factors empowers informed decision-making throughout the diamond acquisition and jewelry design processes.

4. Gemstone Evaluation

Gemstone evaluation relies heavily on quantifiable metrics, and for oval diamonds, the length-to-width ratio, calculated using a dedicated calculator, plays a crucial role. This ratio provides an objective measure of the oval’s elongation, directly influencing its aesthetic appeal and market value. Consider two oval diamonds of equal carat weight: one with a ratio within the ideal range (e.g., 1.45:1 to 1.55:1) and another with a less desirable, excessively elongated ratio (e.g., 1.70:1). The ideally proportioned diamond will likely exhibit superior brilliance and fire due to optimized light return, increasing its value compared to the elongated diamond, which might suffer from a bow-tie effect, diminishing its sparkle and desirability. This demonstrates the practical significance of the ratio in gemstone evaluation, moving beyond subjective assessments to quantifiable comparisons.

Further emphasizing the connection, consider how cut quality assessments incorporate the length-to-width ratio. Grading laboratories use this ratio as a key factor in determining the overall cut grade of an oval diamond. A diamond with proportions outside the ideal range might receive a lower cut grade, impacting its market price. This underscores how the ratio, calculated via the dedicated tool, directly translates into a tangible aspect of gemstone evaluation impacting professional grading and pricing. This exemplifies the practical application of the ratio beyond theoretical considerations, impacting real-world transactions within the diamond market.

In summary, the length-to-width ratio, readily calculated using an oval diamond ratio calculator, is an indispensable tool in gemstone evaluation. It provides a quantifiable metric directly linked to aesthetic appeal, light performance, and ultimately, market value. This objective measure fosters transparency in the diamond trade, enabling informed decisions based on established standards and facilitating consistent evaluations across the industry. Understanding this connection empowers both professionals and consumers to navigate the complexities of the diamond market with greater confidence and clarity, emphasizing the importance of proportional analysis in comprehensive gemstone evaluation.

5. Jewelry Design Aid

Jewelry design often hinges on subtle nuances of proportion and shape, particularly when incorporating gemstones like oval diamonds. An oval diamond ratio calculator functions as a crucial design aid, providing quantifiable data that informs aesthetic choices and ensures harmonious integration of elements. Understanding the precise length-to-width ratio empowers designers to create pieces that maximize a diamond’s brilliance and complement its unique characteristics.

  • Proportion and Harmony

    A key aspect of jewelry design involves achieving visual balance and harmony. The length-to-width ratio of an oval diamond significantly influences its perceived shape and how it interacts with other design elements. A longer, more slender oval might be elegantly incorporated into a pendant, emphasizing verticality, while a shorter, rounder oval could be ideal for a ring, creating a softer, more classic look. The calculator allows designers to select diamonds with proportions that align with the overall design vision, ensuring a cohesive and aesthetically pleasing final product.

  • Setting Selection and Customization

    The setting of a diamond significantly impacts its appearance. The length-to-width ratio informs setting choices, ensuring the diamond is properly secured and showcased. For instance, a prong setting might be more suitable for a longer oval, providing adequate support along its elongated shape, while a bezel setting might complement a shorter, rounder oval, framing its shape effectively. The calculator aids in selecting settings that enhance the diamond’s features and integrate seamlessly with its proportions.

  • Maximizing Brilliance and Sparkle

    A diamond’s brilliance is influenced by its cut and proportions. The length-to-width ratio is crucial in determining how light interacts with an oval diamond. Ideal ratios maximize light return, resulting in a more vibrant and sparkling stone. Designers can use the calculator to select diamonds with proportions that optimize brilliance, ensuring the finished piece captures and reflects light effectively, enhancing its overall aesthetic impact. This consideration is particularly important for center stones, where brilliance is a primary focus.

  • Visualizing Design Concepts

    The calculator provides concrete data that aids in visualizing design concepts. By knowing the precise length-to-width ratio, designers can create accurate representations of how the diamond will appear in a finished piece. This facilitates communication with clients, allowing them to visualize the final product and make informed decisions. Furthermore, the calculator allows designers to experiment with different diamond proportions within their designs, exploring various aesthetic possibilities before finalizing their concepts.

In conclusion, the oval diamond ratio calculator serves as an invaluable tool for jewelry designers. It bridges the gap between aesthetic vision and technical precision, enabling informed decisions regarding proportion, setting selection, and maximizing brilliance. By understanding and utilizing this tool, designers can create jewelry that not only showcases the beauty of oval diamonds but also reflects a thoughtful and meticulous design process, resulting in pieces that are both visually stunning and technically sound.

6. Digital Calculation Tools

Digital calculation tools have revolutionized the analysis of oval diamond proportions, enabling precise and efficient determination of the length-to-width ratio. Prior to these tools, calculations relied on manual measurements and calculations, a process prone to human error and time-consuming. Digital tools, including dedicated oval diamond ratio calculators, streamline this process, allowing for quick and accurate determination of the ratio. This shift has profound implications for gemstone evaluation, jewelry design, and the diamond trade as a whole. Consider a gemologist evaluating a large batch of oval diamonds. Using digital tools, the gemologist can quickly assess the length-to-width ratio for each stone, facilitating efficient sorting and valuation. This contrasts sharply with manual calculations, which would significantly extend the evaluation process.

Furthermore, the precision offered by digital tools enhances the reliability and consistency of measurements. This is particularly crucial in jewelry design, where precise proportions are essential for aesthetic harmony and structural integrity. CAD software incorporating these tools enables designers to create precise models incorporating oval diamonds with specific length-to-width ratios. This precision facilitates communication between designers, manufacturers, and clients, ensuring everyone is working with the same specifications. For instance, a designer can specify the exact ratio required for a particular setting, ensuring the chosen diamond fits perfectly. This level of precision was difficult to achieve with manual calculations alone.

In conclusion, digital calculation tools represent a significant advancement in the analysis and application of oval diamond proportions. These tools offer speed, accuracy, and consistency, transforming processes within the gem and jewelry industry. From efficient gemstone evaluation to precise jewelry design, the impact of these tools is undeniable. The ability to quickly and accurately determine the length-to-width ratio empowers stakeholders across the industry, fostering greater transparency and enabling more informed decision-making. This shift towards digital precision underscores the ongoing evolution of tools and techniques within the field, benefiting both professionals and consumers alike.

7. Precision Measurement

Precision measurement forms the cornerstone of accurate oval diamond ratio calculation. The reliability of the calculated ratio hinges directly on the accuracy of the length and width measurements. Without precise measurements, the resulting ratio lacks meaning and can lead to mischaracterizations of the diamond’s proportions, impacting valuation, setting choices, and overall aesthetic assessments. This underscores the critical connection between precision measurement and the effective utilization of an oval diamond ratio calculator.

  • Instrumentation

    The tools used for measurement directly impact the accuracy of the obtained values. Calibrated digital calipers or specialized gemological measuring instruments offer higher precision compared to standard rulers or hand-held gauges. Microscopic variations in measurement can significantly influence the calculated ratio, especially with smaller diamonds. The use of appropriate instrumentation is therefore paramount for obtaining reliable data for the calculator. For instance, a difference of just 0.1mm can alter the ratio and lead to an inaccurate assessment of the diamond’s proportions.

  • Technique

    Consistent and correct measurement technique is crucial for obtaining accurate length and width dimensions. The diamond should be positioned correctly on the measuring instrument, ensuring it lies flat and stable. Measurements should be taken at the widest points of the length and width, avoiding any tilting or oblique angles. Variations in technique can introduce errors, impacting the calculated ratio and subsequent interpretations. Standardized procedures and training mitigate these risks.

  • Environmental Factors

    Environmental factors, such as temperature, can subtly influence measurements. Materials can expand or contract with temperature fluctuations, potentially introducing minor variations in the measured dimensions. While these variations are often minimal, they can become significant when dealing with precise measurements required for accurate ratio calculations. Controlled environments minimize such influences, ensuring data integrity and consistency.

  • Verification and Validation

    Independent verification of measurements enhances the reliability of the calculated ratio. Repeating the measurement process or having a second individual perform the measurements provides a check against potential errors. This validation step is particularly important for high-value diamonds or when critical design decisions depend on the accuracy of the ratio. Such practices strengthen confidence in the calculated value and mitigate the risk of inaccuracies.

In conclusion, the accuracy of an oval diamond ratio calculator is inextricably linked to the precision of the underlying measurements. Careful consideration of instrumentation, technique, environmental factors, and verification procedures ensures the calculated ratio accurately reflects the diamond’s proportions. This precision underpins informed decision-making across various applications, from gemstone evaluation and jewelry design to the broader diamond trade, highlighting the fundamental role of precise measurement in this specialized field.

8. Aesthetic Considerations

Aesthetic considerations are paramount in the evaluation and selection of oval diamonds, and the oval diamond ratio calculator provides a crucial quantitative tool to inform these considerations. The calculator facilitates objective assessment of a diamond’s proportions by determining its length-to-width ratio, a key factor influencing its overall appearance. This ratio directly impacts the diamond’s perceived shape, brilliance, and the presence or absence of undesirable visual effects. For instance, a ratio considered too high might result in an elongated appearance and a pronounced bow-tie effect, a darkened area across the diamond’s center, diminishing its brilliance and aesthetic appeal. Conversely, a ratio considered too low may yield a diamond that appears excessively round or stubby, deviating from the desired elegant oval shape. The calculator allows for precise determination of this ratio, enabling informed decisions based on individual aesthetic preferences and established standards of beauty.

The practical significance of this understanding extends beyond individual preferences. Market value is often influenced by aesthetic appeal, and diamonds exhibiting proportions considered more aesthetically pleasing typically command higher prices. This connection between objective measurement through the calculator and subjective aesthetic valuations underscores its importance in the diamond trade. Consider two oval diamonds of equal carat weight and color grade, one with a ratio within the ideal range (e.g., 1.45:1 to 1.55:1) and another with a ratio outside this range. The ideally proportioned diamond will likely be perceived as more beautiful and therefore command a premium in the market, demonstrating the tangible impact of aesthetic considerations driven by the ratio on actual market value.

In summary, the oval diamond ratio calculator plays a crucial role in addressing aesthetic considerations in the evaluation and selection of oval diamonds. It provides a quantifiable metric that informs judgments of beauty and desirability, bridging the gap between objective measurement and subjective aesthetic appreciation. This understanding has practical implications for both individual consumers making purchasing decisions and the broader diamond market, where aesthetic appeal directly influences valuation and pricing. The calculator empowers stakeholders with the knowledge to make informed decisions based on both quantifiable data and aesthetic ideals, facilitating a more transparent and objective approach to appreciating the beauty of oval diamonds.

9. Industry Standardization

Industry standardization plays a crucial role in the diamond trade, providing a framework for consistent evaluation and comparison of diamonds, including oval cuts. The oval diamond ratio calculator, while a tool for objective measurement, operates within this framework. Standardization efforts impact how the calculator’s output, the length-to-width ratio, is interpreted and applied in practice, influencing pricing, grading, and consumer perception of quality and value.

  • Cut Grading Standards

    Diamond grading laboratories, such as the Gemological Institute of America (GIA), employ standardized cut grading scales that incorporate the length-to-width ratio for oval diamonds. These scales define ranges of ratios considered ideal, contributing to optimal brilliance and fire. Diamonds falling outside these ranges receive lower cut grades, impacting their market value. The calculator, therefore, provides a quantifiable metric directly relevant to industry-accepted quality assessments.

  • Terminology and Nomenclature

    Standardized terminology ensures consistent communication within the diamond industry. Terms like “length-to-width ratio” have precise definitions, facilitating clear communication between gemologists, jewelers, and consumers. This standardization ensures the calculator’s output is universally understood and applied consistently across the industry, reducing ambiguity and potential misinterpretations.

  • Ideal Proportions and Market Value

    Industry standards often define ideal ranges for oval diamond length-to-width ratios. These ideal proportions, often associated with enhanced brilliance and aesthetic appeal, influence market pricing. Diamonds conforming to these standards often command higher prices, reflecting their perceived desirability. The calculator enables objective assessment of a diamond’s adherence to these standards, providing valuable data for pricing and valuation decisions.

  • Certification and Documentation

    Diamond grading reports often include the length-to-width ratio as part of the diamond’s specifications. This standardized documentation, facilitated by the use of calculators for precise measurement, ensures transparency and traceability within the diamond supply chain. Consumers can rely on this information when making purchasing decisions, and the industry benefits from a standardized system for recording and communicating key diamond characteristics.

In conclusion, the oval diamond ratio calculator operates within a larger framework of industry standardization. This framework provides context and meaning to the calculator’s output, influencing how the length-to-width ratio is interpreted and applied in practice. From cut grading and terminology to market valuation and certification, standardization efforts ensure consistency and transparency within the diamond trade, enhancing consumer confidence and facilitating informed decision-making. The calculator, as a tool for precise measurement, contributes to this standardization by providing the quantifiable data necessary for objective evaluation and comparison of oval diamonds.

Frequently Asked Questions

This section addresses common inquiries regarding oval diamond ratio calculators and their role in evaluating and selecting oval diamonds.

Question 1: How does the length-to-width ratio impact an oval diamond’s appearance?

The ratio directly influences the perceived elongation of the diamond. A higher ratio results in a more slender, elongated oval, while a lower ratio yields a rounder, plumper shape. This visual difference significantly impacts the overall aesthetic and suitability for various jewelry settings.

Question 2: What is considered an ideal length-to-width ratio for an oval diamond?

While personal preferences play a role, industry standards generally consider ratios between 1.45:1 and 1.55:1 ideal for maximizing brilliance and minimizing the bow-tie effect, a darkened area often observed in poorly proportioned ovals.

Question 3: How does the ratio influence the price of an oval diamond?

Diamonds with ratios considered ideal often command higher prices due to their superior light performance and perceived beauty. Conversely, diamonds with ratios outside the ideal range might be priced lower, reflecting potential aesthetic drawbacks such as a prominent bow-tie effect or an undesirable shape.

Question 4: Can a diamond’s ratio be changed after it is cut?

No, the length-to-width ratio is inherent to the diamond’s cut and cannot be altered without recutting the stone, which would result in a loss of carat weight.

Question 5: How does a ratio calculator contribute to informed purchasing decisions?

The calculator empowers consumers with objective data regarding a diamond’s proportions. This data, combined with an understanding of ideal ratios and their impact on appearance, facilitates informed choices aligned with individual preferences and budget considerations.

Question 6: Are there limitations to relying solely on the length-to-width ratio when evaluating an oval diamond?

Yes, while the ratio provides valuable insights into proportions, it should be considered alongside other factors, including carat weight, color, clarity, and overall cut quality, for a comprehensive evaluation. Other aspects, such as the diamond’s outline and faceting symmetry, also contribute to its beauty and light performance.

Understanding the nuances of oval diamond proportions empowers informed decision-making. Utilizing a ratio calculator alongside comprehensive gemstone evaluation ensures the selected diamond aligns with individual aesthetic preferences and quality standards.

For further insights into specific aspects of oval diamond selection and evaluation, consult the following resources or contact a qualified gemologist.

Optimizing Oval Diamond Selection Using Proportional Analysis

Effective use of proportional analysis tools enhances oval diamond selection. The following tips provide practical guidance for leveraging these tools to make informed decisions.

Tip 1: Prioritize the Length-to-Width Ratio: The length-to-width ratio serves as the foundation for evaluating an oval diamond’s shape and potential brilliance. Focus on ratios within the generally accepted ideal range (1.45:1 to 1.55:1) to maximize aesthetic appeal and light performance.

Tip 2: Visualize the Impact of Varying Ratios: Utilize online calculators or visualization tools to compare the appearance of ovals with different ratios. This allows for a clearer understanding of how subtle differences in the ratio translate into distinct shapes, aiding in selecting a diamond that aligns with individual preferences.

Tip 3: Consider the Bow-Tie Effect: Excessively elongated ovals often exhibit a bow-tie effect, a darkened area across the center of the stone. Prioritize ratios that minimize this effect to ensure optimal brilliance and sparkle.

Tip 4: Balance Ratio with Other Diamond Characteristics: While the ratio is crucial, it should be considered in conjunction with other factors, including carat weight, color, and clarity. A balanced approach ensures selection of a diamond that excels across all key attributes. For example, a slightly higher ratio might be acceptable if the diamond exhibits exceptional color and clarity.

Tip 5: Evaluate the Diamond’s Outline: A smooth, symmetrical outline contributes to the overall beauty of an oval diamond. Assess the diamond’s outline for any irregularities or unevenness, even if the ratio falls within the ideal range.

Tip 6: Seek Expert Advice: Consult with experienced gemologists or jewelers who can provide personalized guidance based on specific needs and preferences. Their expertise can supplement the information provided by ratio calculators, ensuring informed decision-making.

Tip 7: Utilize Multiple Resources: Combine insights from various sources, including online calculators, grading reports, and expert consultations, to form a comprehensive understanding of a diamond’s proportions and overall quality. This multifaceted approach mitigates the risk of relying solely on a single metric.

By implementing these tips, individuals gain a more comprehensive understanding of how to effectively utilize proportional analysis during the diamond selection process. This empowers confident decision-making based on both objective data and aesthetic considerations.

This detailed exploration of oval diamond proportions and the role of the ratio calculator provides a comprehensive foundation for informed decision-making. The subsequent conclusion synthesizes these insights and offers final recommendations.

Conclusion

This exploration has highlighted the crucial role of proportional analysis, facilitated by an oval diamond ratio calculator, in understanding and evaluating oval diamonds. From the impact of the length-to-width ratio on brilliance and aesthetic appeal to its integration within industry standardization and jewelry design, the significance of this metric is evident. Precise measurement, informed by digital tools, empowers objective assessment and comparison, moving beyond subjective impressions. The interplay between this objective data and subjective aesthetic considerations informs both market valuation and individual purchasing decisions. Understanding the nuances of ideal proportions, the bow-tie effect, and the interaction between the ratio and other diamond characteristics equips stakeholders across the diamond trade with the knowledge to make informed choices.

As technology continues to refine measurement and visualization techniques, the ability to analyze and appreciate the subtleties of oval diamond proportions will only improve. This ongoing evolution underscores the importance of embracing objective analysis as a complement to aesthetic appreciation, fostering a deeper understanding of the interplay between light, shape, and beauty in these captivating gemstones. This knowledge empowers informed decision-making, benefiting both the industry and individuals seeking the perfect oval diamond.