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A diamond's table percentage is the width of its flat top facet compared to the widest point of the stone — and the "ideal" range depends entirely on shape. A round brilliant looks its best around 54–57%, while a step-cut emerald wants 60–68% to keep its signature hall-of-mirrors flash. Get it right and the stone reads brighter and more alive; stray too far outside the range for its shape and even a well-polished diamond can look glassy or dull.
- Key takeaways
- What is a diamond's table percentage?
- Why table percentage matters more than you'd think
- Ideal table percentage by shape
- Table percentage myths worth clearing up
- Table vs depth: how they work together
- How to check a diamond's table percentage on a certificate
- The Montare standard
- Frequently asked questions
Key takeaways
- Table percentage = table width ÷ average girdle diameter, shown on every certificate as a single number (e.g. 57.0%).
- There is no universal "ideal" table — the correct range shifts by shape, from ~54% for round brilliants to ~69% for radiants.
- Table works together with depth percentage; look at both, never one in isolation.
- A table slightly outside the textbook range can still carry an Excellent cut grade if the rest of the proportions compensate.
- Montare only sets diamonds whose table and depth fall within the ideal window for their specific shape, verified stone-by-stone against the IGI certificate.
What is a diamond's table percentage?
Look straight down at a diamond and the large, flat facet in the centre is the table — it's the "window" light passes through on its way into the stone and back out to your eye. The table percentage is simply that facet's width divided by the diamond's average girdle diameter, expressed as a percentage. A certificate reading "Table: 57%" means the table spans 57% of the stone's total width.
It sounds like a minor spec next to carat weight or colour, but table percentage is one of the few numbers that directly shapes how a diamond performs optically — which is why GIA and AGS both grade it as part of overall cut quality, alongside depth percentage, crown angle, pavilion angle, and symmetry.
Why table percentage matters more than you'd think
Table size controls the balance between two things a diamond does with light: brilliance (the white light bouncing straight back at you) and fire (the flashes of spectral colour). A larger table lets in more light and produces a bigger, brighter face-up flash — but push it too large and the stone starts losing fire and can develop a washed-out, "fish-eye" look where you can see straight through the pavilion. Too small a table, and light gets trapped and scattered oddly, leaving the stone looking dark in the centre despite being technically well-cut.
The right table percentage is the point where a given shape's facet structure produces maximum brightness without sacrificing contrast or sparkle — and that sweet spot is different for every cut, because every shape distributes its facets differently.
Ideal table percentage by shape
These ranges reflect widely used GIA Excellent-equivalent and AGS Ideal benchmarks for each shape, drawn from diamond-grading education resources. Treat them as a guide, not a hard cutoff — a diamond's overall cut grade is always determined by how all of its proportions work together, not any single number.
| Shape | Ideal table % | Ideal depth % | What to watch for |
|---|---|---|---|
| Round brilliant | 54–57% | 59–62.6% | The tightest range of any shape — small deviations affect light return more noticeably |
| Princess | 69–75% | 64–75% | Wide acceptable range because the pointed corners change how light travels |
| Cushion | 61–68% | 61–68% | Montare sets elongated cushions toward 60–62% for a crisper, more brilliant face-up look |
| Emerald | 60–68% | 61–67% | Step-cut facets mean a low table can look flat and glassy rather than brilliant |
| Asscher | 60–68% | 61–67% | Behaves like a square emerald; cropped corners help mask a slightly larger table |
| Oval | 53–63% | 58–62% | Table size interacts with the bow-tie effect at the centre of the stone |
| Pear | 53–65% | 58–62% | Table placement affects how evenly light plays between the point and the rounded end |
| Marquise | 53–63% | 58–62% | A slimmer table tends to read as more brilliant along the elongated shape |
| Radiant | 61–69% | 61–67% | Brilliant-cut facets on a cropped rectangle — closer in behavior to cushion than emerald |
| Heart | 56–62% | 58–62% | Symmetry between the two lobes matters as much as the table number itself |
Every centre diamond is Triple Excellent, D–E, VVS and at least three carats — the hard calls are made for you.
Design your ringTable percentage myths worth clearing up
"Bigger table = bigger-looking diamond." Not quite. Table percentage is a ratio, not a size — a 1-carat and a 3-carat round brilliant can share the exact same 56% table and look proportionally identical, just at different scales. What actually makes a diamond look larger for its weight is a shallower total depth and a bigger spread (diameter) relative to carat weight, which is a separate calculation from table percentage entirely.
"One ideal range fits every diamond." This is the most common mistake we see buyers make when they read a general "50–60% is ideal" rule online and apply it to a fancy shape. That rule was written for round brilliants. A radiant or princess cut with a 58% table isn't a better-cut stone — it's likely under-cut and closer to a step-cut shape than a brilliant one, since those shapes are graded against their own, higher ideal range.
"A high table percentage is a red flag." Only outside the range for that shape. A 65% table is a problem on a round brilliant but sits comfortably mid-range on an emerald or radiant. Context — meaning shape — always comes first.
Table vs depth: how they work together
Table and depth percentage are graded together for a reason — they're a trade-off. A diamond with a large table and shallow depth can look bigger face-up per carat, but risks losing fire. A diamond with a smaller table and deeper pavilion concentrates more fire but can appear slightly smaller for its weight, or "nail-head" dark in the centre if pushed too deep. Reading one number without the other tells you very little; always check both against the ranges for that specific shape, and read our full explainer on table and depth percentage if you want the mechanics in more depth.
How to check a diamond's table percentage on a certificate
Every IGI or GIA report lists "Table" as a percentage in the proportions section, usually right next to depth percentage and measurements (length × width × depth in millimetres). Most certificates also include a proportions diagram — a simple side-view sketch of the stone with crown angle, pavilion depth, and girdle thickness marked — which is worth glancing at alongside the raw numbers. Compare the table percentage against the range for the diamond's specific shape, not a generic "50–60%" rule of thumb, which only really applies to round brilliants. If you're shopping a fancy shape and the listing doesn't show a proportions diagram or a table/depth percentage at all, that's a sign to ask before you buy — a reputable seller should be able to produce the full certificate on request, not just headline 4Cs. For a full walkthrough of every line on a lab report, see how to read a diamond certificate.
The Montare standard
Every diamond Montare sets is lab-grown, D–E colour, VVS1–VVS2 clarity, Triple Excellent cut, and IGI certified at a 3 carat minimum — and "Triple Excellent" is precisely the cut grade that keeps table percentage inside the ideal window for that stone's shape. We don't buy loose diamonds by carat weight and hope the proportions work out; every stone is checked against its certificate before it's approved for a Montare setting, table and depth included. Read more on our Triple Excellent cut standard or start designing with a shape and setting of your own on the ring builder.
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Open the ring builder →Frequently asked questions
What is a good table percentage for a diamond?
It depends on the shape. Round brilliants look best around 54–57%, while shapes like radiant and princess sit naturally higher, in the 61–75% range. There's no single "good" number that applies across all shapes.
Does a bigger table make a diamond look bigger?
A larger table can make the face-up view look slightly larger and brighter, but push it too far outside the ideal range for that shape and you risk losing fire and depth of sparkle — the stone can start to look flat rather than simply "bigger."
Can a diamond have an Excellent cut grade with a table percentage outside these ranges?
Occasionally, yes. GIA and AGS grade cut holistically — table, depth, crown angle, pavilion angle, and symmetry all interact, so a stone slightly outside one range can still earn an Excellent or Ideal grade if the other proportions compensate. That said, staying within the ranges above is the safest way to buy without needing to inspect a diamond in person.
Is table percentage the same for every diamond shape?
No. It's one of the most shape-dependent numbers in diamond grading, ranging from the low 50s for round brilliants and ovals up to the high 60s or low 70s for princess and radiant cuts.
Where do I find a diamond's table percentage?
On the proportions section of its IGI or GIA certificate, typically shown as a percentage alongside depth percentage and the stone's millimetre measurements.
Does Montare only sell diamonds within the ideal table range?
Yes. Every Montare diamond carries a Triple Excellent cut grade, which requires table and depth percentages — along with crown angle, pavilion angle, and symmetry — to fall within the ideal range for that stone's shape, verified against its IGI certificate before it's approved for a setting.
The Montare standard
Lab-grown · D–E colour · VVS clarity · Triple Excellent · 3ct minimum · IGI certified
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