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Chatham Loose Stone Size Vs. Weight Chart

Now you can SAVE nearly 50% Chatham loose stones from JewelryImpressions.com. Refer to the chart below to determine the size and carat weight of stone you're interested in, then visit our Loose Stone Price Lists for more information. Please note, weights and sizes on this chart are estimates and can vary up to 10% either way. Loose stone quotes will be based on the weight of actual stones available.


Round (mm)

Diamond (ct.)

Emerald (ct.)

Ruby & Sapphire (ct.)

Alexandrite (ct.)
2.0 0.03 0.03 0.04 0.04
2.5 0.06 0.06 0.08 0.08
3.0 0.10 0.10 0.15 0.14
3.5 0.16 0.15 0.22 0.19
4.0 0.22 0.22 0.34 0.33
4.5 0.33 0.32 0.45 0.43
5.0 0.45 0.45 0.66 0.59
5.5 0.59 0.57 0.83 0.75
6.0 0.77 0.72 1.09 1.05
6.5 1.00 0.95 1.36 1.23
7.0 1.25 1.10 1.64 1.63
7.5 1.55 1.40 2.12 2.00
8.0 1.85 1.75 2.50 2.35
Oval (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5x3 0.25 0.20 0.29 0.29
6x4 0.52 0.40 0.59 0.54
7x5 0.93 0.66 1.06 1.00
8x6 1.45 1.13 1.65 1.50
9x7 2.07 1.60 2.36 2.20
10x8 3.08 2.40 3.50 3.26
11x9 4.31 3.40 4.90 4.10
12x10 5.98 4.10 6.80 5.60
Trillion (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
3x3 0.11 0.09 0.12 0.12
4x4 0.27 0.22 0.32 0.29
5x5 0.52 0.43 0.65 0.55
6x6 0.91 0.68 0.95 0.87
7x7 1.43 1.10 1.60 1.43
8x8 1.77 1.55 2.00 1.89
9x9 3.04 2.25 3.42 3.00
Marquise (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
4x2 0.10 0.08 0.12 0.10
4.5x2.5 0.13 0.10 0.15 0.14
5x2.5 0.18 0.12 0.20 0.19
5x3 0.21 0.16 0.24 0.22
6x3 0.25 0.21 0.29 0.27
7x3.5 0.35 0.32 0.45 0.40
8x4 0.73 0.50 0.75 0.66
9x4.5 0.90 0.65 1.00 0.95
10x5 1.00 0.95 1.30 1.22
12x6 2.00 1.50 2.06 1.90
Octagon (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5x3 0.25 0.25 0.35 0.33
6x4 0.50 0.48 0.70 0.65
7x5 1.00 0.87 1.30 1.20
8x6 1.76 1.35 2.00 1.86
9x7 2.70 2.16 3.10 2.86
10x8 3.90 3.00 4.40 4.18
11x9 5.50 4.00 6.18 6.00
12x10 7.40 5.10 8.30 7.90
Pear (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5x3 0.22 0.20 0.25 0.23
6x4 0.46 0.35 0.53 0.49
7x5 0.76 0.58 0.87 0.80
8x5 0.90 0.76 1.02 0.95
9x6 1.42 1.05 1.62 1.45
10x7 2.14 1.59 2.43 2.27
11x9 3.72 3.00 4.18 3.95
Heart (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
3x3 0.11 0.09 0.15 0.14
4x4 0.27 0.22 0.32 0.31
5x5 0.52 0.43 0.65 0.57
6x6 0.91 0.68 1.00 0.90
7x7 1.43 1.10 1.60 1.52
8x8 1.77 1.55 2.00 2.05
9x9 3.04 2.25 3.42 3.10
Square (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
2x2 0.06 0.04 0.06 0.07
3x3 0.20 0.12 0.22 0.21
4x4 0.50 0.28 0.56 0.45
5x5 0.60 0.50 0.80 0.75
Baguette (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
4x2 0.11 0.10 0.14 0.12
5x3 0.27 0.20 0.32 0.28
6x4 0.60 0.47 0.66 0.63
7x5 1.05 0.90 1.20 1.11
  • Sizes specified are given in millimeter (mm) measurements.
  • All above weights are based on average depth and girdle thickness. Larger stones are subject to a wider weight range. Sizes & weights can vary up to 10% either way.
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    Chatham Gem Facts:
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    Additional Links:
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    Standard ring stock size is approximately 6.5. Closeout prices apply to the item descriptions given. Some items may be special ordered in different sizes or colors at higher prices. Contact us if you would like a special order. Photo color will vary based on monitor settings. All weights & measurements are close approximations.


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