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Chatham-Created Gemstones

Chatham Loose Stone Size Vs. Weight Chart

Now you can SAVE on Chatham loose stones from OurCustomWeddingRings.com. Refer to the chart below to determine the size and carat weight of stone you’re interested in. Please note, weights and sizes on this chart are estimates and can vary up to 10% either way.  For more detailed information and prices, select the gemstone you want from our drop-down menu. When shopping for a colored stone, it’s always best to specify the size you want by the physical measurements.

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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