Professional Square Cushion Cut Diamond Size Chart

Carat to MM / MM to Carat Square Cushion Cut Diamond Size Comparison Tool

Before there was Brilliant Round, there was a Cushion Cut Diamond reigning supreme. The Cushion, which has a history spanning over 200 years, is still one of the most dominant and beloved shapes today, thanks to its stunning light retention and elegance. Below you will find a meticulously researched, easy access conversions of Cushion Cut MM to Carat and Carat to MM, ranging from 0.04 cts, to 5.25.

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Cushion Cut MM to Carat Diamond Conversion Charts

0.04 - 0.69 cts

CUSHION CUT 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.

Ava Diamonds

0.70 - 5.25 cts

CUSHION CUT CARAT WEIGHT	CUSHION MM SIZE
0.70 - 0.77 ct.	5.00 - 5.20 mm.
0.80 - 0.98 ct.	5.30 - 5.40 mm.
1.00 - 1.15 ct	5.40 - 5.60 mm.
1.20 - 1.27 ct	5.70 - 6.50 mm.
1.30 - 1.45 ct	6.10 - 6.90 mm.
1.50 - 1.60 ct	6.40 - 7.10 mm.
1.65 - 1.80 ct	6.60 - 7.30 mm.
2.00 - 2.30 ct	7.00 - 7.80 mm.
2.40 - 2.60 ct	7.70 - 8.30 mm.
2.70 - 2.90 ct	8.00 - 8.50 mm.
3.00 - 3.30 ct	8.10 - 8.70 mm.
3.40 - 3.60 ct	8.40 - 8.90 mm.
3.70 -3.90 ct	8.70 - 9.20 mm.
4.00 - 4.20 ct	9.00 - 9.60 mm.
4.40 - 4.70 ct	9.40 - 9.70 mm.
5.00 - 5.25 ct	9.80 - 10.50 mm.

Ava Diamonds

Cushion Cut Diamond on Hand

A cushion cut diamond truly shines when you see it resting on the finger. The soft square outline with rounded corners sits comfortably and delivers generous coverage that feels substantial yet graceful.The brilliant-style faceting creates vibrant fire and lively scintillation. Light dances across the large facets in a dynamic way that highlights the cushion’s classic pillow shape and impressive spread, making the diamond appear noticeably larger than its carat weight on the hand.

Many people love how it appears even larger and more dazzling in real life than the carat weight suggests, making it one of the most popular choices for engagement rings and statement jewelry.

What are the Ideal Proportions of a Square Cushion Cut?

While it has undeniable class, sophistication, and light performance, the Square Cushion Cut Diamond does present some difficulties due to its high amount of unique variants. The following proportions guide should help you get a head start and act as a standard based on our own experience for finding well proportioned cushion cut diamonds.

What is the Ideal Diamond Depth and Table for the Square Cushion Cut?

	EXCELLENT	VERY GOOD	GOOD
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%
Girdle	Very Thin	Slightly Thick	Very Thin to Thick
Culet	None	Very Small	Small

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

The length to width ratio in cushions shaped diamonds is extremely important, and quite delicate. As you can see by the chart below, a small margin can make all the difference.

	EXCELLENT / VERY GOOD	GOOD
Length To Width Ratio	1.00 - 1.03	1.04 - 1.05