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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (8): Square Shape 13x13 mm Gems Clear All
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ID: 3706191 pcs
15.58ct Malachite
12.96 x 12.48 x 7.38mm
USD 16.98
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ID: 3706181 pcs
21.33ct Malachite
12.91 x 12.56 x 9.52mm
USD 23.25
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ID: 3853271 pcs
13.29ct Ametrine
13.46 x 12.76 x 8.26mm
USD 93.03
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ID: 3349701 pcs
20.27ct Ruby-Zoisite
13.19 x 12.75 x 8.64mm
USD 40.54
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ID: 4179071 pcs
10.97ct Smoky Quartz
12.62 x 12.59 x 10.42mm
USD 19.75
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ID: 4146991 pcs
10.83ct Rose Quartz
13.00 x 12.90 x 9.98mm
USD 54.15
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ID: 3420981 pcs
15.43ct Malachite
13.01 x 12.96 x 7.28mm
USD 21.88
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ID: 4147001 pcs
11.36ct Rose Quartz
12.65 x 12.48 x 11.08mm
USD 56.80
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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