Moissanite Size Chart

Moissanite Size Chart

Our IceMoissanite gemstones are lab-grown, always upholding the highest ethical and environmental standards. As a result, our gemstones have an astonishing white light reflection, also known as brilliance. In fact, IceMoissanite’s brilliance outclasses the one of diamonds by a mile and a half and this is because our gems have no natural flaws.

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

The weight of gemstones has historically been measured 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. A 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.

The Original Atlantis Ring

Wondering how big a 1.00 carat round moissanite is? The size chart below will help you convert millimeters (mm) size to Diamond Equivalent Weight (DEW) for Round Brilliant Cut Moissanite. This cut boasts 58 facets and offers exceptional brilliance. Thanks to its timeless appearance, 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.

Our Products

Colorless Moissanite

EcoMoissanite is the Original Retailer of IceMoissanite gemstones. All our gems are colorless (DEF) and are almost perfect on the 4Cs scale. In fact, our moissanite cannot be differentiated from diamonds with the naked eye. IceMoissanite has nearly 2.4 times more fire and 10% more brilliance and luster than diamonds. With a Mohs Scale hardness of 9.25, IceMoissanite is harder than emeralds, rubies, or sapphires and second only to diamonds. IceMoissanite is extremely resistant to scratching, abrasion, breaking, and chipping. No other moissanite gem compares to IceMoissanite!

Colored Moissanite

A unique gem speaks volumes about your personality. For this reason, our fancy color IceMoissanite gemstones can be a striking pick for your engagement ring and custom jewelry. EcoMoissanite offers colored moissanite in Pink, Blue, Green, Yellow, Champagne, Grey and Black. Our premium gemstones are nearly as durable as diamonds and they will maintain their exceptional color, fire and luster during everyday wear and changes in temperature. IceMoissanite’s master gemstone cutters select only the best quality of color shades and clarity. Every rough gem is carefully cut to perfection and polished by hand.

Custom Request

Our company provides a dedicated service for purchasing custom made jewelry. No more settling for generic, readymade rings, and the limitations of retail storefronts. We understand that most of our clients love being involved throughout the designing process, so our experience is structured around having them do just that. In case you could not find the ideal piece in our collections please fill in the contact form below.


Moissanite was born from a meteorite which fell in Arizona over 50,000 years ago. It was first discovered by the chemist Dr. Henri Moissan on a meteor crater in 1893. Dr. Moissan identified the crystals as a new mineral known as silicon carbide. Natural moissanite is extremely rare and almost impossible to find. For a century, the dream of using moissanite on jewelry was impossible, until scientists discovered a way to grow these incredible crystals in a lab. Additionally, as a lab-grown gem, you do not have to worry about the ethical and environmental issues involved with mining.

EcoMoissanite issues Grading Reports and Certificates for loose lab-grown diamonds only. For lab-grown moissanite, we provide our Digital Limited Lifetime Warranty.
Each IceMoissanite gem comes with a limited lifetime warranty which protects it against any changes in color, clarity or brilliance.
Diamond Equivalent Weight (DEW) represents the total weight of a diamond of equal size in mm to our moissanite. Additionally, all our moissanite gemstones are individually hand cut. Although we make every effort to cut per exact proportions and dimensions, slight variations in weight may occur.
While it is true that consistency in color is better controlled in a laboratory, slight variations may occur. This is due to several factors: the duration of the growth, the orientation of the rough gem when it is cut, and its color zoning. Our supplier cuts away approximately 80% of the rough to deliver uniformity and pure clarity.
We can custom cut your moissanite gems to any size and shape within reason. This is considered a Special Order and will not qualify as a return. In order to custom cut your moissanite, please be prepared to send us a diagram or illustration of the desired shape. Please include length, width and depth. There is no such thing as being too detailed.
We have made it very easy for you to own our jewelry by providing a range of payment options. You can pay with your Visa, MasterCard, Discover, Amex and the ever-reliable payment service, PayPal. EcoMoissanite also accepts cryptocurrencies, such as Bitcoin, Bitcoin Cash and Ethereum.
EcoMoissanite offers free express worldwide shipping. All orders will be shipped with a courier service, like FedEx. Your moissanite jewelry  will be sent in a nondescript box that will not give away what is inside. Every package sent from our facilities is always covered by insurance until it transfers to the possession of the buyer.

IMPORTANT: The customs office of the destination country or region may impose customs fees, import duties, taxes, and other charges to your international order. These additional charges required for customs clearance are the responsibility of the recipient. When your order arrives at customs, either the carrier or the customs office will contact you directly to arrange the payment of any charges that may be due.

Orders, once shipped will be fully trackable. An email will be sent to you with the tracking number when then courier service picks up the package. You will be able to track your item online. In case you lose your tracking number, you can always e-mail us.

When you place an order, our work begins immediately. You should expect dispatch within 2-14 days.
Please be advised that items purchased during our special site-wide sales are non-refundable. However, items purchased (unworn, with tags, in original packaging) are eligible to return for store credit or direct size exchange only. Credit or exchange requests will only be honored within 90 days of placing your order.

We are committed to providing exceptional products. In the highly unlikely event that you received a defective item, please let us know immediately so we can resolve the issue as soon as possible.

Kindly note: We are not responsible for any damages caused by wear and tear or if the item does not fit, due to issues with sizing. Damages caused by refitting and resizing on your own before returning will not be accepted.

Thank you! You have successfully signed up. The Discount Code is: MOISSYLOVE