How to Measure a Moissanite Diamond?
Moissanite is measured in length rather than carats. The weight of natural diamonds is measured in carats. Moissanite is measured in millimeters rather than carats because it is about 10% lighter than a natural diamond.
However, contrasting the two is simple. A 6.5 mm round moissanite diamond, for example, would be equivalent to a 1 carat diamond of the same size, but would weigh less. They would appear the same to the others.
All gems have a carat weight, however are sold in various ways. Measuring Moissanite diamonds are offered by their calibrated size, not by their weight.
On the other hand, rubies are marketed by their carat weight. Appears straightforward enough, right?
The Chart Comparing The Sizes of Moissanite and Diamonds
The metric weight of a gemstone will vary depending on the gem's cut and style, even if the gem's diameter remains the same.
Use the following size and form chart as a guide when shopping.
Look for the shape you want
Second, locate the desired carat weight by scrolling down and looking exclusively within that shape. The moissanite carat weight is listed next to it.
Example: A 9.5mm round moissanite weighs 3 carats.
Moissanite Round mm size to carat size comparison
6.5mm is about 1.00CT
7.5mm is about 1.50-1.75ct
8.5mm is about 2.0ct
9mm is about 2.50-2.70ct
9.5mm is about 3.0ct
10mm is about 3.5-3.6ct
10.5mm is about 4.20ct
11.0mm is about 4.75ct
11.5mm is about 5.37ct
12.0mm is about 6.13ct
Moissanite Oval mm size to carat size comparison
7x5mm is about 1.00ct
8x6mm is about 1.50-1.70ct
9x7mm is about 2.0ct
9.5x7mm is about 2.20ct
10x7mm is about 2.82ct
10x7.5mm is about 2.87ct
10x8mm is about 3.0ct
11x9mm is about 4.20ct
12x10mm is about 5.80ct
14x10mm is about 7.75ct
Moissanite Pear mm size to carat size comparison
8x5mm is about 0.90-1.00ct
9x6mm is about 1.50-1.70ct
10x7mm is about 1.90-2.01ct
12x8mm is about 3.50-3.60ct
13x9mm is about 4.70ct
Moissanite Emerald mm size to carat size comparison
7x5mm is about 1.05ct
8x6mm is about 1.50-1.75ct
9x7mm is about 2.5-2.6ct
10x8mm is about 3.20-3.50ct
11x9mm is about 4.90ct
Moissanite Radiant mm size to carat size comparison
6x4mm is about 0.70ct
7x5mm is about 1.20ct
8x6mm is about 1.80ct
9x7mm is about 2.95ct
10x8mm is about 3.90ct
11x9mm is about 5.30ct
Moissanite Cushion mm size to carat size comparison
6.0mm is about 0.90-1.00CT
7.0mm is about 1.50-1.70ct
7.5mm is about 2.0ct
8mm is about 2.4-2.50 ct
8.5mm is about 2.5-2.8 ct
9mm is about 3.0-3.3ct
9.5mm is about 4.0-2.4ct
10mm is about 5.50-5.80ct
10.5mm is about 5.80ct
Moissanite Elongated Cushion mm size to carat size comparison
8x6mm is about 1.61ct
9x7mm is about 2.47ct
9.5x8mm is about 2.69ct
10x8mm is about 3.58ct
11x9mm is about 5.0ct
12x10mm is about 6.72ct
Moissanite Marquise mm size to carat size comparison
10x5mm is about 1.00ct
11x5.5mm is about 1.42ct
12x6mm is about 1.80ct
13x6.5mm is about 2.23ct
14x7mm is about 3.05ct
16x8mm is about 3.68ct
Moissanite Princess mm size to carat size comparison
6.5mm is about 1.70ct
7mm is about 2.10ct
7.5mm is about 2.50ct
8mm is about 3.10ct
8.5mm is about 3.60
9mm is about 4.30ct
10mm is about 5.97ct