Table and depth percentages help describe a gemstone's proportions, but they should be used as screening tools rather than absolute guarantees of beauty.

What table percentage means

The table is the large top facet of the stone. Table percentage compares its width with the overall width of the gemstone.

What depth percentage means

Depth percentage compares the stone's total depth with its width. It influences face-up spread, facet performance, and the height required by the setting.

Why percentages vary by shape

Round, oval, radiant, cushion, emerald, pear, marquise, and Asscher cuts use different facet structures. A proportion that works well for one shape may not suit another.

Problems with excessive depth

• Less visible size for the stated weight or carat equivalent.
• A taller setting or deeper basket.
• Possible dark areas or uneven light return.

Problems with insufficient depth

• Reduced contrast or a watery appearance.
• Windowing in some step cuts.
• Weaker facet definition.

What matters beyond the numbers

Length-to-width ratio, pavilion angles, crown height, facet alignment, outline, bow-tie visibility, and actual video performance all matter. Two stones with similar percentages can look different.

Use measurements and percentages to identify promising stones, then judge the final choice by balanced face-up appearance and realistic light performance.