Thinking of getting a Moissanite engagement ring? here is a chart to help you figure out what size to get. Moissanite is measured by mm and diamonds are measured by their carat weight. Every shape has a different mm size compared to the carat weight of the diamond.

Click Here to shop our Solitaire Moissanite Rings in different shapes

 

Here is how to read this chart.

1. Look for the shape you want

2. Scroll down & within that shape only, look for the carat weight you want. Next to it you will see the mm size for moissanite.

Example: 3 carat round moissanite is 9.5mm

 

Moissanite Round mm size to carat size comparison

6.5mm is approximately 1.00CT

7.5mm is approximately 1.50-1.75ct

8.5mm is approximately 2.0ct

9mm is approximately 2.50-2.70ct

9.5mm is approximately 3.0ct

10mm is approximately 3.5-3.6ct

10.5mm is approximately 4.20ct

11.0mm is approximately 4.75ct

11.5mm is approximately 5.37ct

12.0mm is approximately 6.13ct

 

Moissanite Oval mm size to carat size comparison

7x5mm is approximately 1.00ct

8x6mm is approximately 1.50-1.70ct

9x7mm is approximately 2.0ct

9.5x7mm is approximately 2.20ct

10x7mm is approximately 2.82ct

10x7.5mm is approximately 2.87ct

10x8mm is approximately 3.0ct

11x9mm is approximately 4.20ct

12x10mm is approximately 5.80ct

14x10mm is approximately 7.75ct

 

Moissanite Pear mm size to carat size comparison

8x5mm is approximately 0.90-1.00ct

9x6mm is approximately 1.50-1.70ct

10x7mm is approximately 1.90-2.01ct

12x8mm is approximately 3.50-3.60ct

13x9mm is approximately 4.70ct

 

Moissanite Emerald mm size to carat size comparison

7x5mm is approximately 1.05ct

8x6mm is approximately 1.50-1.75ct

9x7mm is approximately 2.5-2.6ct

10x8mm is approximately 3.20-3.50ct

11x9mm is approximately 4.90ct

 

Moissanite Radiant mm size to carat size comparison

 6x4mm is approximately 0.70ct

 7x5mm is approximately 1.20ct

 8x6mm is approximately 1.80ct

9x7mm is approximately 2.95ct

10x8mm is approximately 3.90ct

11x9mm is approximately 5.30ct

 

Moissanite Cushion mm size to carat size comparison

6.0mm is approximately 0.90-1.00CT

7.0mm is approximately 1.50-1.70ct

7.5mm is approximately 2.0ct

8mm is approximately 2.4-2.50 ct

8.5mm is approximately 2.5-2.8 ct

9mm is approximately 3.0-3.3ct

9.5mm is approximately 4.0-2.4ct

10mm is approximately 5.50-5.80ct

10.5mm is approximately 5.80ct

 

Moissanite Elongated Cushion mm size to carat size comparison

8x6mm is approximately 1.61ct

9x7mm is approximately 2.47ct

9.5x8mm is approximately 2.69ct

10x8mm is approximately 3.58ct

11x9mm is approximately 5.0ct

12x10mm is approximately 6.72ct

 

Moissanite Marquise mm size to carat size comparison

10x5mm is approximately 1.00ct

11x5.5mm is approximately 1.42ct

12x6mm is approximately 1.80ct

13x6.5mm is approximately 2.23ct

14x7mm is approximately 3.05ct

16x8mm is approximately 3.68ct

 

Moissanite Princess mm size to carat size comparison

6.5mm is approximately 1.70ct

7mm is approximately 2.10ct

7.5mm is approximately 2.50ct

8mm is approximately 3.10ct

8.5mm is approximately 3.60

9mm is approximately 4.30ct

10mm is approximately 5.97ct