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: Square Shape 12x12 mm Gems
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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (7): Square Shape 12x12 mm Gems Clear All
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ID: 4695881 pcs
thumb image of 7.8ct Square Cabochon Green Serpentine (ID: 469588)
7.83 ct Serpentine
11.9 x 11.9 mm
$ 16.44
Item in Stock
ID: 3813252 pcs
thumb image of 15.8ct Square Rose-Cut Black Spinel (ID: 381325)
15.78 ct Spinel
11.9 x 11.9 mm
$ 23.67
Item in Stock
ID: 3813262 pcs
thumb image of 16.1ct Square Rose-Cut Black Spinel (ID: 381326)
16.07 ct Spinel
11.8 x 11.8 mm
$ 24.10
Item in Stock
ID: 3813702 pcs
thumb image of 16.5ct Square Rose-Cut Black Spinel (ID: 381370)
16.47 ct Spinel
12 x 11.8 mm
$ 24.70
Item in Stock
ID: 4145681 pcs
thumb image of 9.2ct Princess-Cut Pink Rose Quartz (ID: 414568)
9.15 ct Rose Quartz
12.1 x 12 mm
$ 45.75
Item in Stock
ID: 4487651 pcs
thumb image of 5.7ct Square Cabochon Colorless Golden Rutile Quartz (ID: 448765)
5.73 ct Rutile Quartz
12.2 x 12.1 mm
$ 14.32
Item in Stock
ID: 4146981 pcs
thumb image of 9.8ct Princess-Cut Pink Rose Quartz (ID: 414698)
9.78 ct Rose Quartz
12.1 x 12.1 mm
$ 48.90
Item in Stock
Square Shape 12x12 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 Square shapes, facet cut and cabochon gems available now in 12 mm x 12 mm 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 meant nor 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