Professional Emerald Cut Diamond Size Chart

Emerald Cut Diamond Size Comparison Tool - CT to MM / MM to CT
0.4 - 5.25 cts
EMERALD CUT CARAT WEIGHT LENGTH MM SIZE WIDTH MM SIZE
0.04 - 0.07 ct.3.30 - 3.70 mm.2.00 - 2.40 mm.
0.08 - 0.12 ct.3.60 - 4.20 mm.2.40 - 2.80 mm.
0.13 - 0.17 ct.4.10 - 4.80 mm.2.90 - 3.20 mm.
0.18 - 0.22 ct.4.70 - 5.20 mm.3.10 - 3.30 mm.
0.23 - 0.28 ct.5.10 - 5.80 mm.3.40 - 2.70 mm.
0.30 - 0.37 ct.5.70 - 6.10 mm.3.60 - 4.00 mm.
0.40 - 0.48 ct.6.10 - 6.60 mm.3.90 - 4.40 mm.
0.50 - 0.59 ct.6.50 - 7.30 mm.4.30 - 4.60 mm.
0.60 - 0.67 ct.6.80 - 7.40 mm.4.60 - 4.80 mm.
0.70 - 0.78 ct.7.30 - 8.00 mm.4.80 - 5.00 mm.
0.80 - 0.88 ct.8.00 - 8.40 mm.5.10 - 5.30 mm.
0.90 - 0.98 ct.8.20 - 8.50 mm.5.30 - 5.50 mm.
1.00 -1.15 ct.8.40 - 8.90 mm.5.60 - 5.80 mm.
1.20 - 1.27 ct.9.00 - 9.50 mm.5.90 - 6.00 mm.
1.30 - 1.45 ct.9.30 - 9.60 mm.6.10 - 6.20 mm.
1.50 - 1.60 ct.9.70 - 10.20 mm.6.30 - 6.50 mm.
1.65 - 1.80 ct.10.00 - 10.50 mm.6.50 - 6.70 mm.
2.00 - 2.30 ct.10.70 - 11.50 mm.7.00 - 7.30 mm.
2.40 - 2.60 ct.11.50 - 11.80 mm.7.40 - 7.70 mm.
2.70 - 2.90 ct.11.70 - 12.30 mm.7.70 - 7.80 mm.
3.00 - 3.30 ct.12.40 - 13.00 mm.8.00 - 8.20 mm.
3.40 - 3.60 ct.12.70 - 13.40 mm.8.30 - 8.50 mm.
3.70 -3.90 ct.13.30 - 13.70 mm.8.50 - 8.70 mm.
4.00 - 4.20 ct.13.60 - 14.00 mm.8.70 - 8.90 mm.
4.40 - 4.70 ct.14.00 - 14.30 mm.9.00 - 9.20 mm.
5.00 - 5.25 ct.14.50 - 15.50 mm.9.30 - 9.70 mm.
NGD Diamonds – Contact us for any specific size requirement

Ideal Proportions for Emerald Cut Diamonds

ParameterExcellentVery GoodGood
Table (%)53% - 63%52% - 64% or 64% - 65%51% or 66% - 68%
Depth (%)58% - 62%56% - 57.9% or 62.1% - 66%53% - 55.9% or 66.1% - 71%
GirdleVery Thin to Slightly ThickVery Thin to ThickVery Thin to Thick
CuletNoneVery SmallSmall

What is the Ideal Emerald Cut Diamond Length to Width Ratio?

Category Length to Width Ratio
Excellent 1.45 - 1.55
Very Good 1.40 - 1.45 or 1.56 - 1.65
Good 1.35 - 1.39 or 1.66 - 1.80