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You Selected (2): Square Shape 13x13 mm Gems Clear All
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ID: 3420981 pcs
thumb image of 15.4ct Square Cabochon Multicolor Green Malachite (ID: 342098)
15.43 ct Malachite
13 x 13 mm
$ 21.88
Item in Stock
ID: 4146991 pcs
thumb image of 10.8ct Princess-Cut Pink Rose Quartz (ID: 414699)
10.83 ct Rose Quartz
13 x 12.9 mm
$ 54.15
Item in Stock
Square Shape 13x13 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 13 mm x 13 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