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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (449): Round Shape 12 mm Gems Clear All
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ID: 4262811 pcs
6.74ct Agate
12.26mm x 6.83mm
USD 5.39
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ID: 4229642 pcs
25.67ctw Tiger's Eye
11.62mm
USD 20.54
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ID: 4178501 pcs
5.08ct Quartz
11.93mm x 5.92mm
USD 10.16
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ID: 3239301 pcs
8.96ct Smoky Quartz
12.16mm x 8.27mm
USD 7.62
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ID: 3357941 pcs
12.20ct Pearl
11.88mm
USD 249.00
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ID: 3696201 pcs
7.50ct Quartz Cat's Eye
12.20mm x 7.26mm
USD 24.30
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ID: 3299521 pcs
5.63ct Citrine
12.08mm x 7.50mm
USD 42.22
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ID: 3367551 pcs
5.77ct Citrine
11.98mm x 7.44mm
USD 42.63
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ID: 3618262 pcs
23.84ctw Jasper
12.12mm
USD 23.84
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ID: 3696761 pcs
4.74ct Fire Opal
12.34mm x 8.58mm
USD 153.72
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ID: 4069931 pcs
7.38ct Maw-Sit-Sit
12.47mm x 5.72mm
USD 20.81
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ID: 4170561 pcs
5.40ct Smoky Quartz
12.07mm x 6.00mm
USD 8.10
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ID: 3326061 pcs
4.77ct Citrine
11.95mm x 6.34mm
USD 38.16
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ID: 3844902 pcs
13.20ctw Spinel
12.03mm x 4.67mm
USD 39.60
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ID: 4176832 pcs
10.53ctw Quartz
11.92mm x 5.98mm
USD 21.06
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ID: 3388221 pcs
5.72ct Citrine
11.94mm x 7.70mm
USD 48.05
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ID: 4080521 pcs
5.58ct Smoky Quartz
11.59mm x 9.35mm
USD 9.99
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ID: 4229652 pcs
23.77ctw Tiger's Eye
11.94mm
USD 19.02
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ID: 3701801 pcs
7.73ct Quartz Cat's Eye
12.01mm x 7.37mm
USD 25.12
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ID: 4069871 pcs
7.41ct Maw-Sit-Sit
11.94mm x 6.44mm
USD 20.90
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ID: 4080501 pcs
5.46ct Smoky Quartz
11.85mm x 8.51mm
USD 9.77
Item in Stock
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Round Shape 12 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 12 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