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ID: 4188521 pcs
thumb image of 7.2ct Round Cabochon Cream Star Moonstone (ID: 418852)
7.18ct Star Moonstone
12.50 x 6.46mm
USD 28.72
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ID: 4358531 pcs
thumb image of 8.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435853)
8.11ct Rutile Quartz
13.00 x 6.31mm
USD 20.11
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ID: 4353511 pcs
thumb image of 8.6ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435351)
8.60ct Rutile Quartz
13.06 x 6.65mm
USD 21.33
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ID: 4033841 pcs
thumb image of 10.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403384)
10.51ct Rutile Quartz
13.21 x 7.83mm
USD 33.32
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ID: 3335801 pcs
thumb image of 12.3ct Near Round Silver Pearl (ID: 333580)
12.32ct Pearl
12.76mm
USD 184.80
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ID: 3925861 pcs
thumb image of 8.7ct Round Cabochon Violet Amethyst (ID: 392586)
8.74ct Amethyst
12.95 x 7.22mm
USD 43.70
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ID: 4358142 pcs
thumb image of 15.2ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435814)
15.21ct Rutile Quartz
13.09 x 6.56mm
USD 37.72
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ID: 4031031 pcs
thumb image of 6.6ct Round Cabochon Colorless Black Rutile Quartz (ID: 403103)
6.59ct Rutile Quartz
13.25 x 5.03mm
USD 19.77
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ID: 4142831 pcs
thumb image of 8.6ct Round Petal Cut Pink Rose Quartz (ID: 414283)
8.59ct Rose Quartz
13.32 x 9.78mm
USD 42.95
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ID: 4080991 pcs
thumb image of 6.9ct Diamond-Cut Brown Smoky Quartz (ID: 408099)
6.93ct Smoky Quartz
12.76 x 9.43mm
USD 12.40
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ID: 4142851 pcs
thumb image of 9.1ct Round Petal Cut Pink Rose Quartz (ID: 414285)
9.08ct Rose Quartz
12.94 x 10.37mm
USD 45.40
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ID: 4083681 pcs
thumb image of 8.6ct Diamond-Cut White Quartz (ID: 408368)
8.60ct Quartz
13.39 x 10.57mm
USD 13.33
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ID: 3695161 pcs
thumb image of 8.9ct Round Cabochon White Quartz Cat's Eye (ID: 369516)
8.86ct Quartz Cat's Eye
12.62 x 7.75mm
USD 28.71
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ID: 4031611 pcs
thumb image of 5.9ct Round Cabochon Colorless Black Rutile Quartz (ID: 403161)
5.88ct Rutile Quartz
13.06 x 4.70mm
USD 17.64
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ID: 2193741 pcs
thumb image of 11.3ct Round Facet Red Orange Sphalerite (ID: 219374)
11.33ct Sphalerite
12.75 x 8.03mm
USD 621.50
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ID: 4083781 pcs
thumb image of 7.7ct Diamond-Cut White Quartz (ID: 408378)
7.69ct Quartz
13.09 x 10.17mm
USD 11.92
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ID: 4081011 pcs
thumb image of 7ct Diamond-Cut Brown Smoky Quartz (ID: 408101)
7.04ct Smoky Quartz
13.09 x 8.84mm
USD 12.60
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ID: 4035881 pcs
thumb image of 10.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403588)
10.45ct Rutile Quartz
13.27 x 7.56mm
USD 33.13
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ID: 4038501 pcs
thumb image of 7.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403850)
7.49ct Rutile Quartz
13.17 x 5.70mm
USD 29.96
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ID: 3514631 pcs
thumb image of 9.5ct Round Cabochon White Quartz Cat's Eye (ID: 351463)
9.45ct Quartz Cat's Eye
13.12 x 7.95mm
USD 37.80
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ID: 4069401 pcs
thumb image of 8.1ct Round Cabochon Green Maw-Sit-Sit (ID: 406940)
8.14ct Maw-Sit-Sit
13.24 x 5.52mm
USD 22.95
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Round Shape 13 mm Gems
Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Round shapes, facet cut and cabochon gems available now in 13 mm diameter size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often around 0.3 mm or slightly higher even. This small variance can usually be accommodated for standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart