Professional Half Moon Cut Diamond Size Chart

MM to CT / CT TO MM Size Comparison Tool of Half Moon Shaped Diamonds

The half moon diamond cut is one of the most popular side stone diamonds today. Simply put it is an oval shape cut in half, with one side complete straight, while the other is curved. While the half moon started exclusively as a step cut diamond, nowadays you will also see some remarkable brilliant cut half moons meant to enhance the beauty of similarly brilliant cut center diamonds.

Since Half Moon Shaped Diamonds are always paired up, we’ve developed a ct to mm / mm to ct conversion chart that includes the average carat total weight, which saves a lot of time. You will find that both the length and width are taken into account. If you ever wondered about the ct to mm conversion of a 0.40 pair of half moons in mm, or a 3.80 mm pair in ctw, you can do so in a matter of seconds.

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Half Moon Cut Diamond Conversion Charts From CT to MM / MM to CT

0.25 - 1.30 ctw

PAIR AVERAGE TOTAL WEIGHT	HALF MOON LENGTH MM SIZE	HALF MOON WIDTH MM SIZE
0.25 - 0.27 ct tw	3.60 - 3 .80 mm.	2.60 - 2.70 mm.
0.28 - 0.32 ct tw	3.60 - 3 .80 mm.	2.80 - 3.00 mm.
0.30 - 0.35 ct tw	3.90 - 4.10 mm.	2.70 - 2.80 mm.
0.36- 0.38 ct tw	3.90 - 4.10 mm.	2.90 - 3.10 mm.
0.30 - 0.33 ct tw	4.20 - 4.10 mm.	2.70 - 2.80 mm.
0.36 - 0.40 ct tw	4.20- 4.30 mm.	2.90 - 3.10 mm.
0.36 - 0.39 ct tw	4.40 - 4.50 mm.	2.70 - 2.80 mm.
0.42 - 0.45 ct tw	4.40 - 4.50 mm.	2.90 - 3.10 mm.
0.38 - 0.43 ct tw	4.60 - 4.80 mm.	2.70 - 2.80 mm.
0.43 - 0.46 ct tw	4.60 - 4.80 mm.	2.90 - 3.10 mm.
0.39 - 0.44 ct tw	4.90 - 5.20 mm.	2.70 - 2.80 mm.
0.46 - 0.50 ct tw	4.90 - 5.20 mm.	2.90 - 3.10 mm.
0.53 - 0.57 ct tw	4.90 - 5.20 mm.	3.20 - 3.30 mm.
0.56 - 0.61 ct tw	5.40 - 5.60 mm.	3.20 - 3.40 mm.
0.70 - 0.80 ct tw	5.90 - 6.20 mm.	3.40 - 3.70 mm.
0.90 - 1.00 ct tw	5.90 - 6.20 mm.	3.80 - 4.20 mm.
0.95 - 1.20 ct tw	6.40 - 6.60 mm.	4.00 - 4.30 mm.
1.10 - 1.30 ct tw	6.80 - 7.20 mm.	4.20 - 4.50 mm.

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