DIAMOND CUT

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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.

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SHALLOW

Light hits the bottom of the pavilion and escapes through the bottom of the diamond.

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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.

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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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