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You Selected (474): Round Shape 12 mm Gems Clear All
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ID: 3385561 pcs
thumb image of 5.6ct Round Facet Yellow Golden Citrine (ID: 338556)
5.56ct Citrine
11.78 x 7.46mm
USD 46.70
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ID: 3844922 pcs
thumb image of 13.8ct Round Rose-Cut Black Spinel (ID: 384492)
13.84ct Spinel
11.87 x 4.93mm
USD 41.52
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ID: 3335731 pcs
thumb image of 12.3ct Spherical Golden Pearl (ID: 333573)
12.25ct Pearl
12.07mm
USD 250.14
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ID: 3697301 pcs
thumb image of 8.5ct Round Cabochon White Quartz Cat's Eye (ID: 369730)
8.50ct Quartz Cat's Eye
12.14 x 8.21mm
USD 27.54
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ID: 4080571 pcs
thumb image of 6.2ct Diamond-Cut Brown Smoky Quartz (ID: 408057)
6.20ct Smoky Quartz
11.93 x 9.57mm
USD 11.10
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ID: 3357911 pcs
thumb image of 11.6ct Spherical Golden Pearl (ID: 335791)
11.57ct Pearl
11.73mm
USD 236.14
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ID: 3606141 pcs
thumb image of 8.4ct Round Cabochon White Quartz Cat's Eye (ID: 360614)
8.38ct Quartz Cat's Eye
11.91 x 8.32mm
USD 33.52
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ID: 3696201 pcs
thumb image of 7.5ct Round Cabochon White Quartz Cat's Eye (ID: 369620)
7.50ct Quartz Cat's Eye
12.20 x 7.26mm
USD 24.30
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ID: 4384982 pcs
thumb image of 12.6ct Round Rose-Cut Black Spinel (ID: 438498)
12.64ct Spinel
11.92 x 4.67mm
USD 37.92
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ID: 3358441 pcs
thumb image of 12.6ct Spherical Golden Pearl (ID: 335844)
12.56ct Pearl
12.19mm
USD 256.35
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ID: 4384332 pcs
thumb image of 14.8ct Round Rose-Cut Black Spinel (ID: 438433)
14.75ct Spinel
11.92 x 5.09mm
USD 44.25
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ID: 3694332 pcs
thumb image of 15.4ct Round Cabochon White Quartz Cat's Eye (ID: 369433)
15.44ct Quartz Cat's Eye
11.83 x 7.65mm
USD 50.03
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ID: 4384382 pcs
thumb image of 14.3ct Round Rose-Cut Black Spinel (ID: 438438)
14.30ct Spinel
12.01 x 4.89mm
USD 42.90
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ID: 4013381 pcs
thumb image of 9.7ct Round Petal Cut Brown Smoky Quartz (ID: 401338)
9.66ct Smoky Quartz
12.46 x 10.86mm
USD 24.15
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ID: 3381601 pcs
thumb image of 13.3ct Spherical Silver Pearl (ID: 338160)
13.27ct Pearl
12.31mm
USD 199.05
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ID: 3618182 pcs
thumb image of 25.6ct Drilled Sphere Multicolor Jasper (ID: 361818)
25.59ct Jasper
12.40mm
USD 25.59
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ID: 3878221 pcs
thumb image of 8.6ct Round Facet White Topaz (ID: 387822)
8.55ct Topaz
12.16 x 7.83mm
USD 42.75
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ID: 3357861 pcs
thumb image of 13.8ct Spherical Golden Pearl (ID: 335786)
13.84ct Pearl
12.46mm
USD 282.47
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ID: 4144461 pcs
thumb image of 6.4ct Round Petal Cut Pink Rose Quartz (ID: 414446)
6.42ct Rose Quartz
12.17 x 8.59mm
USD 32.10
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ID: 4324811 pcs
thumb image of 6.8ct Round Petal Cut Brown Smoky Quartz (ID: 432481)
6.81ct Smoky Quartz
12.01 x 9.39mm
USD 11.58
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ID: 4351222 pcs
thumb image of 27.1ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 435122)
27.14ct Rutile Quartz
12.33mm
USD 27.14
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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