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Use our diamond size chart to understand the millimeter (mm) size of each diamond shape.

MM To Carat Conversion Chart: Round MOISSANITE Diamonds And Gemstones

Round MM Size Round Carat Weight
4mm 0.25 ct.
4.5mm 0.36 ct.
5mm 0.5 ct.
5.5mm 0.66 ct.
5.75mm 0.75 ct.
6mm 0.84 ct.
6.5mm 1 ct.
7mm 1.3 ct.
7.5mm 1.67 ct.
8mm 2 ct.
8.5mm 2.11 ct.
9mm 2.75 ct.
9.5mm 3.35 ct.
10mm 3.87 ct.
10.5mm 4.41 ct.
11mm 4.91 ct.


Oval Cut Moissanite Diamond Size Chart (MM)

The Oval cut diamond varies in length-to-width ratios like the Emerald cut diamond. The chart below compiles average conversions for the millimeter measurements and carat weight of oval cut diamonds.

Oval MM Size Oval Carat Weight
5x3 mm. 0.25 ct.
6x4 mm. 0.50 ct.
7x5 mm. 0.75 ct.
7.7x5.7 mm. 1.00 ct.
8x6 mm. 1.25 ct.
8.5x6.5 mm. 1.50 ct.
9x6.5 mm. 1.75 ct.
9x7 mm. 2.00 ct.
10x8 mm. 2.50 ct.
12x8 mm. 3.00 ct.
12x8.5 mm. 3.50 ct.
12.5x8.5 mm. 4.00 ct.
12.75x8.5 mm. 4.50 ct.
12x10 mm. 5.00 ct.



Princess Cut MOISSANITE Diamond Size Chart (MM)

Want to know how big a 2-carat princess cut diamond looks on a hand? Our princess-cut diamond size chart shows you the millimeter (mm) size for princess-cut diamonds.