Moissanite Size Chart

Loose Gemstones & Jewelry

Now you can wear stunning jewelry guilt-free and be dazzled by the brilliance of our IceMoissanite gemstones. Our breathtakingly brilliant moissanite is carefully grown in controlled laboratories and upholds the highest ethical and environmental standards. No diamond can match IceMoissanite’s perfect white light reflection, also known as brilliance. Even master jewelers cannot differentiate IceMoissanite gemstones from diamonds with the naked eye. IceMoissanite’s brilliance outclasses the brilliance of diamonds by a mile and a half, and this is because our gems have little to no natural flaws..

EcoMoissanite Collections


Colorless Moissanite

EcoMoissanite is the Original Retailer of IceMoissanite gemstones. All our gems are colorless (DEF) and are almost perfect on the 4Cs scale. Our moissanite cannot be distinguished from diamonds with the naked eye. IceMoissanite has 2.4 times more fire and 10% more brilliance and luster than diamonds. With a Mohs Scale hardness of 9.25, our moissanite is harder than emeralds, rubies, and sapphires and second only to diamonds. IceMoissanite is highly resistant to scratching, abrasion, breaking, and chipping. No other moissanite gem compares to IceMoissanite! You can wear Ice Moissanite jewelry with confidence, wherever you go and whatever the occasion. View our colorless gems >

IceMoissanite Color Grade

Colored Moissanite

Fancy color moissanite can be a striking pick for your engagement ring and custom jewelry. As the Original Retailer of IceMoissanite, we offer fancy color moissanite gemstones in pink, blue, green, yellow, champagne, grey and black – something to suit everyone. Whichever color you choose, the premium quality of IceMoissanite and its durability will ensure that your gemstones will continue to retain their color and luster during everyday wear. Every rough gem is carefully cut to perfection and polished by hand. IceMoissanite’s master gemstone cutters select only the best color shades and clarity qualities. View our colored gems >

Fancy Color IceMoissanite Stones

Custom Made Beauty

You can purchase custom-made jewelry direct from the experts here at EcoMoissanite. We work with master jewelry designers and makers, putting our in-depth knowledge and experience to good use. Our goal is to design and craft the jewelry pieces of your dreams based on your requirements and ideas, no more ready-made designs, and no more retail storefront limitations. We understand that most of you love getting involved with the designing process, so our service is structured around having you do just that. Discover our concierge service >

Moissanite Size Chart

The sizes of diamonds and moissanite are almost identical in millimeters. However, moissanite gemstones are marginally lighter than diamonds. They have a specific gravity of 3.22 grams per cubic centimeter. For this reason, to fit available settings, it is easier for customers to order our moissanite by millimeter.

The weight of gemstones is measured historically in carats (CT), with 1.00 carat equaling 200 milligrams. Consider the following example: The carat weight of a 6.50 mm round brilliant diamond is 1.00. Moissanite of the same size (6.50mm) will have an actual carat weight of approximately 0.88 CT or 1.00 CT DEW. DEW is used for gemstones to describe their diamond equivalent carat weight.

Do you wonder how big a 1.00 carat round moissanite is? The size chart below will help you convert the millimeters (mm) of a moissanite gemstone to Diamond Equivalent Weight (DEW) for Round Brilliant Cut. This cut boasts 58 facets and offers exceptional brilliance. For decades, the Round Cut has been the most popular choice in rings and loose gemstones.

Moissanite Size Diamond Equivalent Weight (DEW)
0.8 mm. 0.0025 ct.
1 mm. 0.005 ct.
1.15 mm. 0.0067 ct.
1.12 mm. 0.0075 ct.
1.25 mm. 0.01 ct.
1.3 mm. 0.01 ct.
1.5 mm. 0.015 ct.
1.75 mm. 0.02 ct.
1.8 mm. 0.025 ct.
2 mm. 0.03 ct.
2.25 mm. 0.04 ct.
2.5 mm. 0.06 ct.
2.75 mm. 0.08 ct.
3 mm. 0.11 ct.
3.25 mm. 0.14 ct.
3.5 mm. 0.17 ct.
3.75 mm. 0.21 ct.
4 mm. 0.25 ct.
4.25 mm. 0.28 ct.
4.5 mm. 0.36 ct.
4.75 mm. 0.44 ct.
5.0 mm. 0.50 ct.
5.25 mm. 0.56 ct.
5.5 mm. 0.66 ct.
5.75 mm. 0.75 ct.
6 mm. 0.84 ct.
6.25 mm. 0.93 ct.
6.5 mm. 1.00 ct.
6.8 mm. 1.25 ct.
Moissanite Size Diamond Equivalent Weight (DEW)
7 mm. 1.30 ct.
7.3 mm. 1.50 ct.
7.5 mm. 1.67 ct.
7.75 mm. 1.75 ct.
8 mm. 2.00 ct.
8.25 mm. 2.11 ct.
8.5 mm. 2.43 ct.
8.7 mm. 2.50 ct.
9 mm. 2.75 ct.
9.1 mm. 3.00 ct.
9.5 mm. 3.35 ct.
9.75 mm. 3.61 ct.
10 mm. 3.87 ct.
10.25 mm. 4.16 ct.
10.5 mm. 4.41 ct.
10.75 mm. 4.57 ct.
11 mm. 4.91 ct.
11.25 mm. 5.49 ct.
11.5 mm. 5.85 ct.
12 mm. 6.84 ct.
12.25 mm. 7.26 ct.
12.5 mm. 7.36 ct.
12.75 mm. 7.52 ct.
13 mm. 8.51 ct.
13.5 mm. 9.53 ct.
14 mm. 10.49 ct.
15 mm. 12.89 ct.
16 mm. 16.06 ct.
17 mm. 18.00 ct.

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We appreciate that moissanite, the stunning alternative to diamond, may be new to many. We are happy to discuss our eco-friendly, ethical, and conflict-free gemstones in detail. Alternatively, please fill out the form below. We reply within 48 hours. In the meantime, you can learn more on our FAQs page by clicking here.

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