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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (494): Round Shape 12 mm Gems Clear All
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ID: 3322501 pcs
5.84ct Citrine
11.98mm x 7.18mm
USD 40.88
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ID: 4166761 pcs
4.95ct Smoky Quartz
12.07mm x 6.02mm
USD 7.43
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ID: 4080521 pcs
5.58ct Smoky Quartz
11.59mm x 9.35mm
USD 9.99
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ID: 4040661 pcs
7.10ct Rutile Quartz
12.22mm x 5.94mm
USD 28.40
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ID: 4080531 pcs
5.77ct Smoky Quartz
11.80mm x 9.25mm
USD 10.33
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ID: 4182521 pcs
6.23ct Star Moonstone
12.04mm x 5.85mm
USD 24.92
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ID: 4166751 pcs
5.21ct Smoky Quartz
12.08mm x 6.07mm
USD 7.82
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ID: 3335751 pcs
11.36ct Pearl
12.23mm
USD 170.40
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ID: 3606261 pcs
8.97ct Quartz Cat's Eye
12.34mm x 8.17mm
USD 35.88
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ID: 3617381 pcs
11.38ct Jasper
11.98mm
USD 11.38
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ID: 4176882 pcs
10.44ctw Quartz
12.03mm x 6.02mm
USD 20.88
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ID: 3696121 pcs
7.43ct Quartz Cat's Eye
12.22mm x 6.92mm
USD 24.07
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ID: 4321241 pcs
6.86ct Smoky Quartz
11.86mm x 9.68mm
USD 11.66
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ID: 3385721 pcs
5.24ct Citrine
12.01mm x 6.75mm
USD 41.92
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ID: 4388541 pcs
6.49ct Spinel
11.88mm x 4.70mm
USD 19.47
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ID: 4383762 pcs
14.02ctw Spinel
12.06mm x 5.25mm
USD 42.06
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ID: 3299531 pcs
5.87ct Citrine
11.93mm x 7.51mm
USD 44.02
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ID: 3606171 pcs
8.34ct Quartz Cat's Eye
12.41mm x 7.88mm
USD 33.36
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ID: 3237681 pcs
8.18ct Smoky Quartz
12.25mm x 7.13mm
USD 6.95
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ID: 3605491 pcs
7.70ct Quartz Cat's Eye
11.80mm x 7.77mm
USD 30.80
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ID: 3335781 pcs
10.87ct Pearl
12.33mm
USD 163.05
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