MM (size) to Carat (weight) charts:

While carat is a measure of weight, it does not always paint the full picture of the visual size of the stone once it's on your finger. For that reason, we recommend learning the length x width MM measurements of your chosen stone.

Please note that we can cut or source any size moissanite or diamond for you - even if it's not listed in these charts.

Round

 Round Stone Size Approximate Carat Equivalent
5 x 5 mm 0.5
5.5 x 5.5 mm 0.63
6 x 6 mm 0.8
6.5 x 6.5 mm 1
7 x 7 mm 1.2
7.5 x 7.5 mm 1.5
8 x 8 mm 2
8.5 x 8.5mm 2.5
9 x 9 mm 3
9.5 x 9.5 mm 3.5
10 x 10 mm 4
10.5 x 10.5 mm 4.5
11 x 11 mm 4.9

Oval

Oval Stone Size Approximate Carat Equivalent
5 x 5 mm 0.5
5.5 x 5.5 mm 0.63
6 x 6 mm 0.8
6.5 x 6.5 mm 1
7 x 7 mm 1.2
7.5 x 7.5 mm 1.5
8 x 8 mm 2
8.5 x 8.5mm 2.5
9 x 9 mm 3
9.5 x 9.5 mm 3.5
10 x 10 mm 4
10.5 x 10.5 mm 4.5
11 x 11 mm 4.9

Pear

Pear Stone Size Approximate Carat Equivalent
7.25 x 4.75 mm 0.75
8 x 5 mm 1
9 x 6 mm 1.5
9.75 x 6.25 mm 1.8
10.25 x 6.75 mm 2.1
11 x 7 mm 2.5
11.25 x 7.25 mm 2.75
11.5 x 7.5 mm 3
12.5 x 7.75 mm 3.5
13 x 8 mm 4
13.5 x 8.25 mm 4.5
14 x 8.5 mm 5
14.75 x 9.25 mm 6

Radiant

Radiant Stone Size Approximate Carat Equivalent
6.25 x 4.75 mm 0.8
7 x 5 mm 1
8 x 6 mm 1.75
8.5 x 6 mm 2
9 x 6.25 mm 2.25
9.25 x 6.75 mm 2.5
9.5 x 7 mm 2.75
10 x 7 mm 3
10 x 8 mm 3.5
10.5 x 8 mm 4
11 x 8.25 mm 4.5
11 x 8.5 mm 5
11 x 9 mm 5.6
12.25 x 9.25 mm 6.3

Emerald

Radiant Stone Size Approximate Carat Equivalent
6.25 x 4.75 mm 0.8
7 x 5 mm 1
8 x 6 mm 1.75
8.5 x 6 mm 2
9 x 6.25 mm 2.25
9.25 x 6.75 mm 2.5
9.5 x 7 mm 2.75
10 x 7 mm 3
10 x 8 mm 3.5
10.5 x 8 mm 4
11 x 8.25 mm 4.5
11 x 8.5 mm 5
11 x 9 mm 5.6
12.25 x 9.25 mm 6.3

Marquise

Marquise Stone Size Approximate Carat Equivalent
10 x 5 mm 1
12 x 6 mm 1.5
12.5 x 6.25 mm 1.75
13 x 6.5 mm 2
14 x 7 mm 2.5
15 x 7.25 mm 3
15.5 x 8.25 mm 3.5
16 x 8.5 mm 4
16.5 x 8.75 mm 4.5
17 x 8.75 mm 5
17.5 x 9 mm 5.5

Elongated Cushion

Elongated Cushion Stone Size Approximate Carat Equivalent
6.25 x 4.75 mm 0.75
6.75 x 5.25 mm 1
8 x 6 mm 1.5
8 x 6.5 mm 1.8
8.5 x 6.5 mm 2
9 x 7 mm 2.5
9 x 8 mm 3
10 x 8 mm 3.5
10.5 x 8.5 mm 4
11 x 9 mm 5
12.5 x 9.5 mm 6.25

 

Cushion

Cushion Stone Size Approximate Carat Equivalent
5 x 5 mm 0.75
5.5 x 5.5 mm 1
6.5 x 6.5 mm 1.5
7 x 7 mm 2
7.5 x 7.5 mm 2.5
8 x 8 mm 3
8.5 x 8.5 mm 3.5
9 x 9 mm 4
9.5 x 9.5 mm 4.75
10 x 10 mm 5.6
10.5 x 10.5 mm 6.5
11 x 11 mm 7.5

 

Asscher

Asscher Stone Size Approximate Carat Equivalent
5 x 5 mm 0.75
5.5 x 5.5 mm 1
6.5 x 6.5 mm 1.5
7 x 7 mm 2
7.5 x 7.5 mm 2.5
8 x 8 mm 3
8.5 x 8.5 mm 3.5
9 x 9 mm 4.1
9.5 x 9.5 mm 4.8
10 x 10 mm 5.6
10.5 x 10.5 mm 6.5
11 x 11 mm 7.5

 

Princess

Princess Stone Size Approximate Carat Equivalent
5 x 5 mm 0.75
5.5 x 5.5 mm 1
6.5 x 6.5 mm 1.5
7 x 7 mm 2
7.5 x 7.5 mm 2.5
8 x 8 mm 3
8.5 x 8.5 mm 3.5
9 x 9 mm 4.2
9.5 x 9.5 mm 5
10 x 10 mm 5.75
10.5 x 10.5 mm 6.5
11 x 11 mm 7.5

 

Heart

Heart Stone Size Approximate Carat Equivalent
6 x 6 mm 0.75
6 x 7 mm 1
6.5 x 7.5 mm 1.3
7 x 8 mm 1.5
8 x 9 mm 2.3
8.5 x 9.5 mm 2.75
9.5 x 9.5 3
9 x 10 mm 3.25
10 x 10 mm 3.5

 

All About Moissanite

  • Brilliance & Refraction

    There is no stone on earth - natural or synthetic, that compares to the brilliance of moissanite. Moissanite is the world's most brilliant gemstone - it is exceptionally bright and sparkly.

  • Fire Dispersion

    Moissanite measures at2.4 timesthe fire of diamonds. This results in a beautifully iridescent sparkle. This fire can be either reduced or emphasized depending on the cut of the stone.

  • Clarity

    All of our moissanite is graded at VVS+ or greater, meaning that it is free of any visible imperfections: virtually flawless. A clearer stone produces a brighter, more beautiful stone.

  • Durability & Hardness

    Moissanite is the second hardest gemstone in the world - second only to diamonds! It is an extremely durable, scratch-resistant stone, making it perfect for everyday wear.

We hope this guide helps you find the ring of your dreams.

For any other assistance, please contact us and we'd be happy to help!

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