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Length-to-width ratio describes the relationship between a gemstone’s face-up length and width. It is especially useful for comparing the outlines of oval, emerald, pear, marquise, cushion, and other fancy-shaped stones.
What Does Length-to-Width Ratio Measure?
The ratio expresses how elongated or square a stone appears from above. A ratio near 1.00 indicates similar length and width; a higher number indicates a more elongated outline.
How to Measure or Calculate Length-to-Width Ratio
Divide the length by the width using the same unit for both measurements. For example, a stone measuring 9.0 mm long and 6.0 mm wide has a 9.0 ÷ 6.0 = 1.50 length-to-width ratio.
Where Length-to-Width Ratio Is Used in Jewelry
Jewelers use the ratio to compare gemstone shapes, plan settings, and discuss visual proportions with customers. Preferred outlines vary by cut style and personal taste; there is no universally best ratio.
Common Measurement and Sizing Mistakes
Do not confuse the ratio with carat weight, depth, or a cut-quality grade. Use consistent measurements and compare actual images because two stones with the same ratio can still look different.
Related Jewelry Measurement Terms
- Millimeter: A unit commonly used for gemstone dimensions.
- Carat Weight: A measure of gemstone mass, not face-up dimensions.
- Diamond Shape: The outline or form of a cut diamond.
For further learning, explore the Custom Karat Jewelry Glossary.
About Author Brijesh Sharma
Brijesh Sharma is a jewelry retail industry author who shares expert insights on diamonds, lab-grown jewelry, custom designs, and smart jewelry buying. His content helps customers understand quality, pricing, trends, and craftsmanship so they can make confident jewelry purchase decisions.
