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ID: 3237712 pcs
thumb image of 13.3ct Round Cabochon Smoky Brown Smoky Quartz (ID: 323771)
13.32ct Smoky Quartz
12.04 x 6.59mm
USD 11.32
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ID: 4012101 pcs
thumb image of 8.6ct Round Petal Cut Brown Smoky Quartz (ID: 401210)
8.59ct Smoky Quartz
12.34 x 10.84mm
USD 21.48
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ID: 4012011 pcs
thumb image of 6.6ct Round Petal Cut Brown Smoky Quartz (ID: 401201)
6.63ct Smoky Quartz
11.53 x 9.46mm
USD 16.58
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ID: 4388581 pcs
thumb image of 8ct Round Rose-Cut Black Spinel (ID: 438858)
8.01ct Spinel
12.00 x 5.50mm
USD 24.03
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ID: 3606281 pcs
thumb image of 8.1ct Round Cabochon White Quartz Cat's Eye (ID: 360628)
8.14ct Quartz Cat's Eye
12.13 x 7.66mm
USD 32.56
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ID: 3844961 pcs
thumb image of 5.7ct Round Rose-Cut Black Spinel (ID: 384496)
5.65ct Spinel
11.77 x 4.24mm
USD 16.95
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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: 4190541 pcs
thumb image of 7.9ct Round Cabochon Cream Star Moonstone (ID: 419054)
7.88ct Star Moonstone
12.27 x 6.97mm
USD 31.52
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ID: 3385501 pcs
thumb image of 5.1ct Round Facet Yellow Golden Citrine (ID: 338550)
5.09ct Citrine
11.90 x 6.70mm
USD 40.72
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ID: 4069881 pcs
thumb image of 7.4ct Round Cabochon Green Maw-Sit-Sit (ID: 406988)
7.37ct Maw-Sit-Sit
12.42 x 5.77mm
USD 20.78
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ID: 4187561 pcs
thumb image of 7.7ct Round Cabochon Cream Peach Star Moonstone (ID: 418756)
7.66ct Star Moonstone
12.02 x 7.31mm
USD 30.64
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ID: 3701781 pcs
thumb image of 8ct Round Cabochon White Quartz Cat's Eye (ID: 370178)
7.97ct Quartz Cat's Eye
12.22 x 7.48mm
USD 25.90
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ID: 3605411 pcs
thumb image of 7.5ct Round Cabochon White Quartz Cat's Eye (ID: 360541)
7.46ct Quartz Cat's Eye
12.26 x 7.36mm
USD 29.84
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ID: 4176491 pcs
thumb image of 5ct Diamond-Cut White Quartz (ID: 417649)
5.04ct Quartz
11.95 x 8.01mm
USD 8.06
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ID: 4166831 pcs
thumb image of 5.3ct Round Checkerboard (double sided) Brown Smoky Quartz (ID: 416683)
5.25ct Smoky Quartz
11.99 x 6.12mm
USD 7.88
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ID: 2486611 pcs
thumb image of 5.6ct Round Facet Green Prehnite (ID: 248661)
5.61ct Prehnite
11.85 x 6.95mm
USD 25.24
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ID: 4388591 pcs
thumb image of 6.9ct Round Rose-Cut Black Spinel (ID: 438859)
6.91ct Spinel
12.00 x 4.80mm
USD 20.73
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ID: 4087821 pcs
thumb image of 6.3ct Diamond-Cut White Quartz (ID: 408782)
6.27ct Quartz
12.37 x 8.94mm
USD 9.72
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ID: 3383231 pcs
thumb image of 4.8ct Round Facet Yellow Golden Citrine (ID: 338323)
4.81ct Citrine
12.04 x 6.21mm
USD 34.02
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ID: 3839052 pcs
thumb image of 14.8ct Round Rose-Cut Black Spinel (ID: 383905)
14.78ct Spinel
12.02 x 5.22mm
USD 44.34
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ID: 4178521 pcs
thumb image of 5.3ct Round Checkerboard (double sided) Lemon Quartz (ID: 417852)
5.31ct Quartz
11.96 x 5.98mm
USD 10.62
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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