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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (486): Round Shape 12 mm Gems Clear All
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ID: 3382121 pcs
13.04ct Pearl
12.26mm
USD 195.60
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ID: 4166791 pcs
4.80ct Smoky Quartz
12.06 x 5.65mm
USD 7.20
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ID: 4388561 pcs
7.33ct Spinel
12.06 x 5.13mm
USD 21.99
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ID: 3357891 pcs
13.69ct Pearl
12.34mm
USD 279.41
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ID: 3390201 pcs
5.40ct Citrine
11.78 x 7.32mm
USD 43.20
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ID: 3291021 pcs
4.79ct Citrine
12.09 x 6.10mm
USD 34.20
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ID: 4080951 pcs
5.97ct Smoky Quartz
12.26 x 8.68mm
USD 10.69
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ID: 4384992 pcs
14.99ctw Spinel
12.09 x 5.07mm
USD 44.97
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ID: 3606181 pcs
8.82ct Quartz Cat's Eye
12.09 x 8.46mm
USD 35.28
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ID: 4176421 pcs
7.37ct Quartz
12.39 x 10.56mm
USD 11.79
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ID: 3617381 pcs
11.38ct Jasper
11.98mm
USD 11.38
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ID: 4350582 pcs
23.79ctw Rutile Quartz
11.97mm
USD 23.79
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ID: 3381561 pcs
12.75ct Pearl
12.10mm
USD 191.25
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ID: 4348972 pcs
22.30ctw Rutile Quartz
11.62mm
USD 22.30
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ID: 3605481 pcs
7.56ct Quartz Cat's Eye
11.76 x 7.60mm
USD 30.24
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ID: 3381621 pcs
12.71ct Pearl
12.06mm
USD 190.65
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ID: 4080501 pcs
5.46ct Smoky Quartz
11.85 x 8.51mm
USD 9.77
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ID: 3381581 pcs
12.45ct Pearl
11.98mm
USD 186.75
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ID: 3844912 pcs
11.75ctw Spinel
11.66 x 4.35mm
USD 35.25
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ID: 4388591 pcs
6.91ct Spinel
12.00 x 4.80mm
USD 20.73
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ID: 4176862 pcs
10.20ctw Quartz
12.01 x 5.78mm
USD 20.40
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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