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USE THE CHARTS BELOW AND THE INFORMATON ON THE NEXT PAGE AS A GUIDELINE IN HELPING YOU TO PURCHASE A ROUND DIAMOND, NONE OF THIS INFORMATION IS GOING TO BE HELPFUL FOR A FANCY SHAPE STONE YOU WILL HAVE TO SEE THE DIAMOND FOR YOURSELF TO DETERMINE THE CUT QUALITY. THERE IS NO SUCH THING AS AN IDEAL CUT FANCY SHAPE STONE AND IF SOMEONE TELLS YOU ONE IS THEY ARE LYING. DONT TAKE MY WORD FOR IT, GO TO GIAS WEBSITE AND SEE FOR YOURSELF. THEY HAVE NO PAGES OR PARAMETERS FOR ANY SHAPE FANCY SHAPED STONE.
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THIS CHART IS WHAT THE AGS LAB USES TO DETERMINE MCUT GRADES, THIS ONLY APPLIES TO ROUND DIAMONDS.
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AGS GRADE
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Table Diameter
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Crown Angle
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Girdle
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Pavilion Depth%
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Culet
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0
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53%-57.5%
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34-35.5
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Thin,
Medium,
Sl.Thick
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42.5% - 43.5%
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Pointed,
Very Small, Small, Medium
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1
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-53%,
58%-59%
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33-33.5
36
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Very Thin
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44%
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Slightly Large
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2
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60%-61%
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32.5, 36.5
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42%, 44.5%
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3
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51%,
62%-63%
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32, 37
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Thick
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Large
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4
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64%-65%
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31.5, 37.5
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41.5%
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5
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50%
66%-67%
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31, 38
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Very Thick
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41%, 45%
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Very Large
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6
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68%-69%
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30.5, 38.5
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46%
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7
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49%,
70%-71%
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30, 39
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Ext.Thin,
Ext.Thick
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40.5%,
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Extremely Large
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8
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48%,
72%-73%
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29.5, 39.5
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Ext.Thick
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40%, 47%
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Extremely Large
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9
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47%,
74%-75%
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29
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Ext.Thick
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-39%, 48%
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Extremely Large
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10
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-47%,
75%+
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-29, 39.5+
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Ext.Thick
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- 39%,
49% +
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Extremely Large
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Here is a chart of what the ideal cut diamond measurements were meant to be. Even if you look at what the ideal cut diamonds measurements should be, you can see that the percentages are not exact numbers. There is always a few percentage points variation.
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Please contact our Web master with questions or comments.
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