Professional Square Cushion Cut Diamond Size Chart

Carat to MM / MM to Carat Square Cushion Cut Diamond Size Comparison Tool
Cushion Cut MM to Carat Diamond Conversion Charts
0.04 - 5.25 cts
CUSHION CARAT WEIGHT CUSHION CUT MM SIZE
0.04 - 0.05 ct.1.90 - 2.00 mm.
0.05 - 0.06 ct.2.10 - 2.20 mm.
0.07 - 0.08 ct.2.30 - 2.40 mm.
0.09 - 0.10 ct.2.50 - 2.60 mm.
0.11 - 0.12 ct.2.70 - 2.80 mm.
0.13 - 0.15 ct.2.90 - 3.00 mm.
0.16 - 0.18 ct.3.10 - 3.20 mm.
0.20 - 0.22 ct.3.20 - 3.40 mm.
0.23 - 0.26 ct.3.50 - 3.60 mm.
0.28 - 0.31 ct.3.70 - 3.80 mm.
0.32 - 0.35 ct.3.80 - 3.90 mm.
0.38 - 0.40 ct.4.10 - 4.20 mm.
0.43 - 0.47 ct.4.20 - 4.40 mm.
0.50 - 0.55 ct.4.40 - 4.60 mm.
0.56 - 0.58 ct.4.60 - 4.80 mm.
0.60 - 0.69 ct.4.80 - 5.00 mm.
0.70 - 0.77 ct.5.00 - 5.20 mm.
0.80 - 0.98 ct.5.30 - 5.40 mm.
1.00 - 1.15 ct5.40 - 5.60 mm.
1.20 - 1.27 ct5.70 - 6.50 mm.
1.30 - 1.45 ct6.10 - 6.90 mm.
1.50 - 1.60 ct6.40 - 7.10 mm.
1.65 - 1.80 ct6.60 - 7.30 mm.
2.00 - 2.30 ct7.00 - 7.80 mm.
2.40 - 2.60 ct7.70 - 8.30 mm.
2.70 - 2.90 ct8.00 - 8.50 mm.
3.00 - 3.30 ct8.10 - 8.70 mm.
3.40 - 3.60 ct8.40 - 8.90 mm.
3.70 - 3.90 ct8.70 - 9.20 mm.
4.00 - 4.20 ct9.00 - 9.60 mm.
4.40 - 4.70 ct9.40 - 9.70 mm.
5.00 - 5.25 ct9.80 - 10.50 mm.
NGD Diamonds – Contact us for any specific size requirement

Ideal Proportions for Square Cushion Cut Diamonds

ParameterExcellentVery GoodGood
Table (%)61% - 67%58% - 60% or 65% - 70%56% - 57% or 70% - 71%
Depth (%)61% - 67%58% - 60.9% or 67.1% - 70%56% - 57.9% or 70.1% - 71%
GirdleVery ThinSlightly ThickVery Thin to Thick
CuletNoneVery SmallSmall

What is the Ideal Square Cushion Cut Diamond Length to Width Ratio?

Category Length to Width Ratio
Excellent / Very Good 1.00 - 1.03
Good 1.04 - 1.05