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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (455): Round Shape 12 mm Gems Clear All
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ID: 3696211 pcs
7.59ct Quartz Cat's Eye
11.99mm x 7.70mm
USD 24.59
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ID: 4012081 pcs
6.58ct Smoky Quartz
11.96mm x 9.05mm
USD 16.45
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ID: 4086431 pcs
8.86ct Bloodstone
12.09mm x 8.40mm
USD 31.01
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ID: 3366591 pcs
5.61ct Citrine
12.01mm x 7.34mm
USD 41.23
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ID: 2715661 pcs
5.73ct Prehnite
12.07mm x 6.83mm
USD 25.79
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ID: 3382111 pcs
13.34ct Pearl
12.27mm
USD 200.10
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ID: 3366831 pcs
5.78ct Citrine
11.85mm x 7.83mm
USD 40.46
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ID: 3845562 pcs
14.69ctw Spinel
11.93mm x 5.18mm
USD 44.07
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ID: 4036871 pcs
7.25ct Rutile Quartz
12.33mm x 6.34mm
USD 22.98
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ID: 3605461 pcs
7.73ct Quartz Cat's Eye
11.87mm x 7.61mm
USD 30.92
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ID: 4084261 pcs
5.89ct Quartz
11.93mm x 9.13mm
USD 9.13
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ID: 3839052 pcs
14.78ctw Spinel
12.02mm x 5.22mm
USD 44.34
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ID: 3299551 pcs
5.75ct Citrine
12.00mm x 7.34mm
USD 47.44
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ID: 3782752 pcs
14.29ctw Spinel
11.81mm x 5.26mm
USD 42.87
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ID: 3990651 pcs
5.22ct Quartz
11.70mm x 7.46mm
USD 8.30
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ID: 3617361 pcs
11.97ct Jasper
12.12mm
USD 11.97
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ID: 3380931 pcs
5.78ct Citrine
11.89mm x 7.62mm
USD 40.46
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ID: 3326051 pcs
5.76ct Citrine
11.83mm x 7.48mm
USD 50.69
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ID: 3385671 pcs
5.30ct Citrine
11.87mm x 6.94mm
USD 46.64
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ID: 2829761 pcs
6.31ct Smoky Quartz
11.90mm x 6.20mm
USD 7.89
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ID: 4013361 pcs
8.77ct Smoky Quartz
12.47mm x 11.04mm
USD 21.92
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