DIAMOND CUT
A diamond’s cut is the key characteristic that determines the fire and beauty of the stone. Cut refers to the relationship between the diamond proportions and determines how the stone reflects and absorbs light. Diamonds with a better cut tend to be more expensive.
Round stones are the only diamond shapes where GIA specifies a ‘Cut’ grade. For other shapes, buyers should look for stones within a range of table, depth, crown angle, and pavilion depth measurements. The below tables explain the proportions that produce the most visually appealing stones.
Because of its heightened importance in determining the visual properties of a diamond, HYSTR recommends that buyers purchase ‘Excellent,’ ‘Ideal,’ or ‘Very Good’ cut stones.
SHALLOW
Light hits the bottom of the pavilion and escapes through the bottom of the diamond.
IDEAL
Light hits the bottom of each pavilion at the angle where most of the light can reflect back to the top of the crown.
DEEP
Light hits the bottom of the pavilion too low and therefore escapes through the bottom of the diamond.
HYSTR CUT GUIDANCE
The GIA provides a ‘Cut’ grading for Round stones. For other diamond shapes, it is possible to determine well-cut diamonds by understanding the best proportion ranges.
Below is a breakdown of our recommended cut by shape and carat weight. HYSTR recommends ‘Excellent’ or ‘Very Good’ cut stones.
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 52.5 - 58 | 51.5 - 52.4 or 58.1 - 60.5 |
50.5 - 51.4 or 60.6 - 64 |
< 50.5 |
| Depth % | 59.3 - 62.1 | 58 - 59.2 or 62.2 - 63.5 |
57 - 57.9 or 63.6 - 64 |
< 57 or > 64 |
| Crown Angle | 32.7 - 36.3 | 31.2 - 32.6 or 36.4 - 37.8 |
30.2 - 31.1 or 37.9 - 39.3 |
< 30.2 or > 39.3 |
| Pavilion Depth | 42.2 - 43.8 | 42 - 42.1 or 43.8 - 44 |
41 - 41.9 or 44.1 - 45.5 |
< 39.5 or > 47 |
| Girdle | Thin, Medium, or Slightly Thick | Thin, Medium, or Slightly Thick | Very Thin to Thick | Ex Thin to Ex Thick |
| Culet | None | Very Small | Small | Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 61 - 71 | 58 - 60 or 72 - 74 |
56 - 57 or 72 - 82 |
< 56 or 82 > |
| Depth % | 63 - 75 | 58 - 62.9 or 75.1 - 80 |
< 57.9 or 80.1 > |
|
| Length / Width Ratio | 1.00 - 1.03 | 1.04 - 1.05 | > 1.06 | |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 60 - 67 | 58 - 59.9 or 67.1 - 70 |
55 - 57.9 or 70.1 - 71.9 |
< 54.9 or > 72 |
| Depth % | 60 - 67 | 58 - 59.9 or 67.1 - 70 |
55 - 57.9 or 70.1 - 71.9 |
< 54.9 or > 72 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 60 - 68 | 57 - 59.9 or 68.1 - 72 |
53 - 56.9 or 72.1 - 75 |
< 52.9 or > 75.1 |
| Depth % | 60 - 67 | 58 - 59.9 or 67.1 - 71 |
53 - 57.9 or 71.1 - 75 |
< 52.9 or > 75.1 |
| Length / Width Ratio | 1.00 - 1.03 | 1.04 - 1.05 | > 1.06 | |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 60 - 68 | 57 - 59.9 or 68.1 - 72 |
53 - 56.9 or 72.1 - 75 |
< 52.9 or > 75.1 |
| Depth % | 60 - 67 | 58 - 59.9 or 67.1 - 71 |
53 - 57.9 or 71.1 - 75 |
< 52.9 or > 75.1 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 60 - 67 | 58 - 59.9 or 67.1 - 70 |
55 - 57.9 or 70.1 - 71.9 |
< 54.9 or > 72 |
| Depth % | 60 - 67 | 58 - 59.9 or 67.1 - 70 |
55 - 57.9 or 70.1 - 71.9 |
< 54.9 or > 72 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 54 - 63 | 53.9 - 52 or 62.9 - 65 |
51.9 or 65.5 - 72 |
< 51 or > 68 |
| Depth % | 58 - 62 | 53 - 54.9 or 65.1 - 72 |
< 53 or > 72 |
|
| Length / Width Ratio | 1.82 - 2.00 | 1.75 - 1.819 or 2.009 - 2.17 |
1.63 - 1.749 or 2.171 - 2.32 |
< 1.63 or > 2.32 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 54 - 63 | 53.9 - 52 or 62.9 - 65 |
51.9 or 65.1 - 68 |
< 51 or > 68 |
| Depth % | 58 - 62 | 53 - 54.9 or 65.1 - 72 |
< 53 or > 72 |
|
| Length / Width Ratio | 1.45 - 1.54 | 1.39 - 1.449 or 1.541 - 1.66 |
1.33 - 1.389 or 1.661 - 1.82 |
< 1.33 or > 1.82 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 54 - 63 | 53.9 - 52 or 62.9 - 65 |
51.9 or 65.5 - 72 |
< 51 or > 68 |
| Depth % | 58 - 62 | 53 - 54.9 or 65.1 - 72 |
< 53 or > 72 |
|
| Length / Width Ratio | 1.37 - 1.50 | 1.3 - 1.369 or 1.501 - 1.56 |
1.299 - 1.24 or 1.561 - 1.62 |
> 1.24 or < 1.62 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
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