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Gemstone Carat Weight Chart

Gemstone Carat Weight Chart (Approximate)

The weights listed below for faceted stones are averages only and based on the specific gravity of quartz (2.66). Stones that have a very deep or very shallow cut or a higher or lower specific gravity will vary from these estimated carat weights.

Round Oval Emerald Pear Marquis
Size Weight
3mm .11
4mm .25
4.5mm .35
5mm .55
5.5mm .70
6mm .90
6.5mm 1.15
7mm 1.50
7.5mm 1.70
8mm 2.05
8.5mm 2.25
9mm 3.00
10mm 3.50
11mm 4.00
12mm 7.15
Size Weight
5x3 .22
6x4 .40
7x5 .80
8x6 1.20
9x7 1.75
10x8 2.50
11x9 3.30
12x10 4.50
14x10 5.50
14x12 7.00
16x12 8.50
18x13 12.00
20x15 15.00
Size Weight
5x3 .25
6x4 .50
7x5 1.10
8x6 1.60
9x7 2.30
10x8 3.00
11x9 4.30
12x10 5.40
14x10 6.60
14x12 8.40
16x12 10.75
18x13 13.75
20x15 18.00
Size Weight
5x3 .21
6x4 .40
7x5 .70
8x5 .80
9x6 1.35
10x7 2.00
11x9 3.00
12x10 3.65
Size Weight
6x3 .20
8x4 .50
10x5 1.00
12x5 1.70
14x7 2.50
15x7 3.00
16x8 4.40
18x9 7.00
20x10 12.00