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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (317): Round Shape 13 mm Gems Clear All
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ID: 3514631 pcs
9.45ct Quartz Cat's Eye
13.12mm x 7.95mm
USD 37.80
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ID: 3873781 pcs
5.54ct Topaz
12.62mm x 6.69mm
USD 33.24
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ID: 3382851 pcs
13.97ct Pearl
12.53mm
USD 209.55
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ID: 4069561 pcs
9.65ct Maw-Sit-Sit
13.45mm x 6.54mm
USD 27.21
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ID: 4142831 pcs
8.59ct Rose Quartz
13.32mm x 9.78mm
USD 42.95
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ID: 4324801 pcs
8.65ct Smoky Quartz
12.53mm x 10.60mm
USD 14.70
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ID: 4358161 pcs
8.01ct Rutile Quartz
12.98mm x 6.26mm
USD 19.86
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ID: 4353491 pcs
8.63ct Rutile Quartz
13.00mm x 6.48mm
USD 21.40
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ID: 4201941 pcs
8.79ct Topaz
13.04mm x 7.17mm
USD 61.53
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ID: 4039651 pcs
8.37ct Rutile Quartz
13.17mm x 6.48mm
USD 33.48
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ID: 3357931 pcs
14.42ct Pearl
12.53mm
USD 294.31
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ID: 4231243 pcs
55.78ctw Rutile Quartz
13.36mm
USD 80.88
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ID: 4083691 pcs
6.63ct Quartz
13.04mm x 8.64mm
USD 10.28
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ID: 4189481 pcs
11.34ct Star Moonstone
12.98mm x 8.80mm
USD 45.36
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ID: 3925911 pcs
8.47ct Amethyst
12.84mm x 7.13mm
USD 42.35
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ID: 3925172 pcs
19.98ctw Amethyst
13.30mm x 8.28mm
USD 99.90
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ID: 3514601 pcs
9.06ct Quartz Cat's Eye
12.97mm x 7.61mm
USD 36.24
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ID: 4358501 pcs
7.54ct Rutile Quartz
13.00mm x 5.90mm
USD 18.70
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ID: 4031891 pcs
11.58ct Star Moonstone
13.29mm x 8.93mm
USD 40.88
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ID: 4033841 pcs
10.51ct Rutile Quartz
13.21mm x 7.83mm
USD 33.32
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ID: 3758991 pcs
9.47ct Amethyst
12.65mm x 8.25mm
USD 47.35
Item in Stock
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Round Shape 13 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 13 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