Of the four Cs, cut is the one that actually makes a diamond sparkle, and it is also the one whose grades buyers misread most. The gap between Excellent and Very Good sounds like a demotion; on the hand it is often invisible. Here is what the cut grade really measures, where the money goes, and when the lower grade is the smarter buy.
What the cut grade actually measures
Colour and clarity describe what a diamond is; cut describes what it does. The grade assesses how the stone’s proportions, angles and finish work together to gather light and return it to your eye as brightness, fire and scintillation. A deep or shallow stone leaks light through its sides and bottom and looks smaller and duller than its weight promises. A well-proportioned one turns every millimetre into display. That is why two diamonds of identical weight, colour and clarity can look like different classes of stone: one of them is simply better at its job.
One detail most buyers never hear: GIA assigns its cut grade only to round brilliants. Ovals, cushions, emeralds and every other fancy shape carry polish and symmetry grades but no overall cut grade, so judging a fancy shape means judging the stone itself, ideally in motion on video.
The cut scale, grade by grade
| Grade | What you see | Our take |
|---|---|---|
| Excellent | Maximum brightness and fire; light returns evenly across the stone | The safe default; most of our rounds are cut to it |
| Very Good | Strong light return; the best examples rival Excellent to the eye | The value play, chosen stone by stone |
| Good | Noticeably less lively; darker zones appear | Only with a discount and honest expectations |
| Fair | Visibly dull or dark; weight hidden in depth | We do not stock it |
| Poor | Light leaks badly; glassy or lifeless | We do not stock it |
Excellent versus Very Good: the honest difference
The grades are ranges, and that is the key to the whole question. A Very Good stone that just missed Excellent, perhaps its table a fraction wide, will look identical to its neighbour in any real-world light, while a Very Good stone at the bottom of the range shows its compromise. The market prices the word, not the individual stone, so the top of the Very Good range is quietly cheaper than it deserves to be. The catch is that the certificate will not tell you which kind of Very Good you are holding; only the stone will. Watch it in motion, compare it beside an Excellent, and if you cannot see the difference, there is no difference worth paying for.
What “Triple Excellent” means, and what it is worth
A stone graded Excellent for cut, polish and symmetry at once is called Triple Excellent, and it earns a premium as the no-questions choice. Worth knowing: of the three, the cut grade does nearly all the visible work. Polish and symmetry grades of Very Good are microscopic distinctions that almost never reach the eye. A cut-Excellent stone with Very Good polish is not a lesser diamond in any way you will see; it is simply a little kinder to your budget. The full picture of how the grades interact lives in our guide to the 4Cs and our colour and clarity chart.
Common questions about cut grades
Is a Very Good cut noticeably worse than Excellent?
Often not at all. The best Very Good stones are visually indistinguishable from Excellent; the weakest are not. It is a range, which is why we judge these stones individually rather than by the word on the paper.
Does cut matter more than colour or clarity?
For how the diamond looks across a room, yes. A brilliant cut hides a little warmth and small inclusions behind sheer light return, while a poor cut advertises every fault. Fix the cut first, then relax the other grades to where the eye stops noticing.
Do fancy shapes have a cut grade?
Not from GIA. Ovals, pears, cushions and the rest carry only polish and symmetry grades, so the shape’s proportions and light return must be judged on the actual stone. It is one more reason we film every diamond we sell in 360° video.
How we buy cut
Our rounds are overwhelmingly cut to Excellent, because it removes the question, and when we take a Very Good stone it is because we have watched it perform and it earns its place. Every listing shows the cut, polish and symmetry grades beside the certificate, and the video lets you confirm with your own eyes what the paper promises. When you are ready, browse our certified diamonds and judge the light for yourself.
