Diamond Cut Specs for several shapes

[oshinbreez]

I always see people asking about specs. I got this chart from Abazias Diamonds. Hope it helps.


Round Cut
Depth Percentage Table Percentage
Ideal 58 - 62 53 - 38
Premium 58.3 - 62.9 52 - 60
Excellent Less than 58.3
-or-
More than 62.99 51.5 - 63
Very Good 51 - 64
Good 50.5 - 57
Fair 50 - 70

Princess Cut
Depth Percentage Table Percentage
Ideal 64 - 75 62 - 68
Premium 60 - 72
Excellent 59 - 74
Very Good 58 - 80 58 - 78
Good 57 - 83 56 - 82
Fair 56 - 84 53 - 85

Oval Cut
Depth Percentage Table Percentage
Ideal 59 - 63 55 - 60
Premium 53 - 61
Excellent 52 - 62
Very Good 58 - 65.4 51 - 64
Good 56 - 68.5 51 - 67
Fair 46 - 71 49 - 70

Emerald Cut
Depth Percentage Table Percentage
Ideal 60 - 65 60 - 65
Premium 59 - 68
Excellent 58 - 69
Very Good 58 - 69 57 - 72
Good 57 - 74 56 - 74
Fair 56 - 78 53 - 76

Marquise Cut
Depth Percentage Table Percentage
Ideal 59 - 63 55 - 60
Premium 53 - 61.5
Excellent 52 - 62
Very Good 58 - 65.4 51 - 64
Good 56 - 68.5 51 - 67
Fair 46 - 71 49 - 70


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[upgrading mama]

thanks for posting this!

 

[oldminer]

There are much more thorough parametric charts on http://www.gemappraisers.com/oldcutgraderules.asp

HOWEVER, parameters are of less importance today than they once were. We are slowy coming into the period where light behavior tools exist that measure or predict how good a diamond will look when properly lit.