Chatham Created Gems

Chatham Loose Stone Size Vs. Weight Chart

Now you can SAVE on Chatham loose stones from JewelryImpressions.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  to the left.

Round (mm)
Diamond (ct.)Emerald (ct.)Ruby & Sapphire (ct.)Alexandrite (ct.)
2.00.030.030.040.04
2.50.060.060.080.08
3.00.100.100.150.14
3.50.160.150.220.19
4.00.220.220.340.33
4.50.330.320.450.43
5.00.450.450.660.59
5.50.590.570.830.75
6.00.770.721.091.05
6.51.000.951.361.23
7.01.251.101.641.63
7.51.551.402.122.00
8.01.851.752.502.35
Oval (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5×30.250.200.290.29
6×40.520.400.590.54
7×50.930.661.061.00
8×61.451.131.651.50
9×72.071.602.362.20
10×83.082.403.503.26
11×94.313.404.904.10
12×105.984.106.805.60
Trillion (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
3×30.110.090.120.12
4×40.270.220.320.29
5×50.520.430.650.55
6×60.910.680.950.87
7×71.431.101.601.43
8×81.771.552.001.89
9×93.042.253.423.00
Marquise (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
4×20.100.080.120.10
4.5×2.50.130.100.150.14
5×2.50.180.120.200.19
5×30.210.160.240.22
6×30.250.210.290.27
7×3.50.350.320.450.40
8×40.730.500.750.66
9×4.50.900.651.000.95
10×51.000.951.301.22
12×62.001.502.061.90
Octagon (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5×30.250.250.350.33
6×40.500.480.700.65
7×51.000.871.301.20
8×61.761.352.001.86
9×72.702.163.102.86
10×83.903.004.404.18
11×95.504.006.186.00
12×107.405.108.307.90
Pear (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
5×30.220.200.250.23
6×40.460.350.530.49
7×50.760.580.870.80
8×50.900.761.020.95
9×61.421.051.621.45
10×72.141.592.432.27
11×93.723.004.183.95
Heart (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
3×30.110.090.150.14
4×40.270.220.320.31
5×50.520.430.650.57
6×60.910.681.000.90
7×71.431.101.601.52
8×81.771.552.002.05
9×93.042.253.423.10
Square (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
2×20.060.040.060.07
3×30.200.120.220.21
4×40.500.280.560.45
5×50.600.500.800.75
Baguette (mm)
Diamond (ct.)
Emerald (ct.)
Ruby & Sapphire (ct.)
Alexandrite (ct.)
4×20.110.100.140.12
5×30.270.200.320.28
6×40.600.470.660.63
7×51.050.901.201.11
  • 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.

Chatham Created Gems

Size Vs. Weight

Carat is a measurement of weight, not size. Because different gemstones have different densities, one can weigh significantly more than the other for the same physical size Consider a 3 inch ball of cork vs. a 3 inch ball of lead. Which weighs more? They are both 3 inches in diameter. But the ball of lead weighs much more because lead is denser than cork. Likewise, ruby and sapphire are denser than diamond. A 1 carat round diamond is about 6.5mm, while a 1 carat ruby is only 6mm. So if you order a 1 carat ruby based on the size of a 1 carat diamond, then the ruby will be much smaller than you expect.

For this reason, it’s important to always order colored stones based on the physical size you need, rather than the carat weight. Too often people are gauging the size they need based on diamond carat weights, and that simply doesn’t work. Please use the chart to the left to help you determine what size gemstone you need.

 

Chatham Created Gems

Check out all our Chatham lab-grown gemstones

Chatham round alexandrite

Chatham Alexandrites

 

Chatham princess cut aqua spinel

Chatham Aqua Spinels

 

Chatham oval blue sapphire

Chatham Blue Sapphires

 

Chatham square cushion champagne sapphire

Chatham Champagne Sapphires

 

Chatham Octagon emerald

Chatham Emeralds

 

Chatham Trillion Padparadscha

Chatham Padparadschas

 

Chatham cushion cut pink sapphire

Chatham Pink Sapphires

 

Chatham marquise ruby

Chatham Rubies

 

Chatham Oval Yellow Sapphire

Chatham Yellow Sapphires