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Average weight for faceted gems
(mm) Oval 
(carats) Sapphire
(carats) Emerald
(carats) Ruby
5x3 0.29 0.20 0.29
6x4 0.59 0.40 0.59
7x5 1.06 0.66 1.06
8x6 1.65 1.13 1.65
9x7 2.36 1.60 2.36
10x8 3.50 2.40 3.50
11x9 4.90 3.40 4.90
12x10 6.80 4.10 6.80
(mm) Round 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
2.0 0.04 0.03 0.04
2.5 0.08 0.06 0.08
3.0 0.15 0.10 0.15
3.5 0.22 0.15 0.22
4.0 0.34 0.22 0.34
4.5 0.45 0.32 0.45
5.0 0.66 0.45 0.66
5.5 0.83 0.57 0.83
6.0 1.09 0.72 1.09
6.5 1.36 0.95 1.36
7.0 1.64 1.10 1.64
7.5 2.12 1.40 2.12
8.0 2.50 1.75 2.50
(mm) Square 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
2x2 0.06 0.04 0.06
3x3 0.22 0.12 0.22
4x4 0.56 0.28 0.56
5x5 0.80 0.50 0.80
(mm)Octagon 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
5x3 0.35 0.25 0.35
6x4 0.70 0.48 0.70
7x5 1.30 0.87 1.30
8x6 2.00 1.35 2.00
9x7 3.10 2.16 3.10
10x8 4.40 3.00 4.40
11x9 6.18 4.00 6.18
12x10 8.30 5.10 8.30
(mm)Marquise
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
4x2 0.12 0.08 0.12
4.5x2.5 0.15 0.10 0.15
5x2.5 0.20 0.12 0.20
5x3 0.24 0.16 0.24
6x3 0.29 0.21 0.29
7x3.5 0.45 0.32 0.45
8x4 0.75 0.50 0.75
9x4.5 1.00 0.65 1.00
10x5 1.30 0.95 1.30
12x6 2.06 1.50 2.06
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