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Quick answer: Table percentage is the width of the top flat facet divided by the diamond's total width. Depth percentage is the diamond's height divided by its width. For round brilliant diamonds, a table of about 54% to 60% and a depth of about 59% to 62.5% usually give excellent sparkle. Fancy shapes have wider acceptable ranges. Diamonds that are too deep look smaller face-up; diamonds that are too shallow can look glassy and leak light.
These two numbers appear on every grading report. Here is how to use them.
Ideal Ranges by Shape (Guide)
| Shape | Table % | Depth % |
|---|---|---|
| Round | 54 to 60 | 59 to 62.5 |
| Oval | 53 to 63 | 58 to 63 |
| Pear | 53 to 63 | 58 to 64 |
| Cushion | 58 to 68 | 61 to 68 |
| Princess | 64 to 72 | 64 to 75 |
| Emerald | 60 to 68 | 60 to 68 |
| Radiant | 61 to 69 | 61 to 67 |
These ranges are general guides; always judge the actual stone's brightness.
What Happens Outside the Range
Too deep
More weight is hidden in the bottom, so the diamond looks smaller than its carat weight, and light can escape through the sides.
Too shallow
The diamond looks large but can show a dull, glassy "fisheye" or "window" effect.
Table too large
More brilliance but less fire.
Table too small
More fire but less brilliance.
Shown: Luxury Moissanite Pear Shaped Halo Stud Earrings
Other Numbers That Matter
- Crown angle: about 34 to 35 degrees is ideal for rounds.
- Pavilion angle: about 40.6 to 41 degrees for rounds.
- Length-to-width ratio: key for fancy shapes; see oval ratio guide.
- Girdle thickness: thin to slightly thick is best.
How to Use These Numbers
- For rounds, start with an Excellent cut grade.
- Check table and depth are within the ideal range.
- For fancy shapes, prioritize photos and videos showing brightness.
Well-Cut Stones at Ivevar
We select well-proportioned stones and hand-set them in our Surat workshop. Every piece ships free worldwide and comes with 30-day easy returns. Browse moissanite earrings.
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Frequently Asked Questions
What is a good table percentage for a round diamond?
About 54% to 60%.
What is a good depth percentage?
About 59% to 62.5% for rounds.
Why does a deep diamond look smaller?
More weight sits below the girdle, reducing face-up size.
Do fancy shapes have cut grades?
Many labs grade only polish and symmetry; use proportions and visuals.
Is a bigger table better?
Not always; balance matters for brilliance and fire.
The Bottom Line
Table and depth percentages are shortcuts to a well-cut diamond. Stay within ideal ranges and trust what your eyes see.
Related Guides
Author Bio
Aumsri Pradhan
Founder, Ivevar Luxury
Aumsri Pradhan is the founder of Ivevar Luxury, a Surat-based fine jewelry brand that designs and handcrafts lab grown diamond and moissanite jewelry in its own workshop. She leads the brand's design and customer experience, from engagement rings and bridal sets to custom pieces made to each client's story. Through the Ivevar blog, she shares practical guidance on lab grown diamonds, moissanite, diamond grading and ring design to help buyers choose with confidence.
