Diamond Table % and Depth % Explained Simply
Two numbers on a diamond certificate — table and depth — have a huge effect on how bright a diamond looks. A jeweler explains the sweet spots in plain language.
What is the table?
The table is the large flat facet on the very top of a round diamond, expressed as a percentage of the diamond's width. It controls how light enters and reflects.
What is the depth?
Depth percentage is the diamond's total height divided by its width. If the diamond is cut too deep, light leaks out the bottom; too shallow, light escapes through the sides. Both kill sparkle.
| Round diamond | Ideal range | Risk if out of range |
|---|---|---|
| Table % | 54% - 60% | Too large: less fire; too small: dull |
| Depth % | 59% - 62.5% | Too deep: dark center; too shallow: glassy look |
| Crown angle | 31° - 35° | Controls fire and brilliance |
| Pavilion angle | 40.6° - 41.8° | Controls how light reflects back |
What to actually do
Don't over-optimize numbers on paper — a Good/Very Good cut graded by IGI or GIA will look beautiful. Pair this with our cut grade guide. Want us to review a specific diamond's proportions? Send the cert on WhatsApp.
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Get a Free Quote Chat on WhatsAppFrequently Asked Questions
Does table size matter more than cut grade?
No. A lab cut grade already averages all these proportions. Use them to compare similar stones, not to override the grade.
Why does my diamond look dark?
Often a depth over 63% or a deep pavilion causing light leakage. Ask for an idealscope image when ordering.
Do these numbers apply to fancy shapes?
They mainly apply to round brilliants. Oval, pear and cushion have different ideal ranges.