Gemstone Size Chart
Rounds
3mm = .10cts
4mm = .25cts
5mm = .50cts
6mm = .75cts
7mm = 1.25cts
8mm = 2.00cts
9mm = 2.75cts
10mm=3.50cts
Emerald-cut
6x4mm = .50cts
7x5mm = 1.00cts
8x6mm = 1.50cts
9x7mm = 2.50cts
10x8mm= 3.00cts
11x9mm= 4.00cts
12x10mm= 5.00cts
14x10mm= 6.00cts
14x12mm= 8.00cts
16x12mm= 10.50cts
Ovals
5x3mm = .25cts
6x4mm = .50cts
7x5mm = 1.00cts
8x6mm = 1.50cts
9x7mm = 2.50cts
10x8mm= 3.00cts
11x9mm= 4.00cts
12x10mm= 5.00cts
14x10mm= 6.00cts
14x12mm= 8.00cts
16x12mm= 10.50cts
Squares
5mm = .75cts
6mm = 1.30cts
7mm = 2.05cts
8mm = 2.90cts
9mm = 4.40cts
10mm= 6.00cts
11mm= 8.00cts
12mm= 10.35cts
Pears
6x5mm = .70cts
7x5mm = .75cts
8x5mm = 1.00cts
9x6mm = 1.50cts
10x7mm= 2.00cts
11x7mm= 2.25cts
12x8mm= 3.00cts
13x9mm= 3.50cts
15x10mm= 5.50cts
16x12mm= 8.60cts
Marquise
4x2mm = .10cts
6x3mm = .30cts
8x4mm = .75cts
10x5mm= 1.00cts
12x6mm= 2.00cts
14x7mm= 3.00cts
16x8mm= 4.00cts
18x9mm= 6.00cts
The weights given are for diamonds cut to ideal proportions and are only approximate carat weights. Colored stones are usually cut with greater volume than diamonds, hence they will weigh more than the chart sizes, the density and specific gravity of a stone can also affect the carat weight. So, the point is not to take these figures too literally, but to use them as a starting point for estimating the carat weight of the gem millimeter size .
Compliments of The International Gem Society
* A proud member of The International Gem Society
2003 .Sandra Stevens
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