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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (309): Round Shape 13 mm Gems Clear All
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ID: 3925881 pcs
10.20ct Amethyst
13.04 x 8.49mm
USD 51.00
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ID: 4323501 pcs
9.51ct Smoky Quartz
13.04 x 11.41mm
USD 16.17
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ID: 4353521 pcs
7.42ct Rutile Quartz
12.98 x 5.89mm
USD 18.40
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ID: 4087811 pcs
6.91ct Quartz
12.70 x 9.50mm
USD 10.71
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ID: 4178601 pcs
8.79ct Quartz
13.52 x 10.35mm
USD 14.06
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ID: 4081001 pcs
6.99ct Smoky Quartz
12.60 x 9.51mm
USD 12.51
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ID: 4353481 pcs
7.29ct Rutile Quartz
13.00 x 5.72mm
USD 18.08
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ID: 4031572 pcs
14.00ctw Rutile Quartz
13.23 x 5.31mm
USD 42.00
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ID: 4142851 pcs
9.08ct Rose Quartz
12.94 x 10.37mm
USD 45.40
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ID: 4229876 pcs
91.64ctw Howlite
12.58mm
USD 73.31
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ID: 4358152 pcs
15.82ctw Rutile Quartz
13.04 x 5.92mm
USD 39.23
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ID: 4081021 pcs
7.57ct Smoky Quartz
13.14 x 9.72mm
USD 13.55
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ID: 3335621 pcs
13.73ct Pearl
12.52mm
USD 280.37
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ID: 4013411 pcs
9.56ct Smoky Quartz
13.04 x 11.05mm
USD 23.90
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ID: 4038541 pcs
5.50ct Rutile Quartz
12.84 x 4.57mm
USD 22.00
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ID: 4087781 pcs
6.27ct Quartz
12.50 x 8.86mm
USD 9.72
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ID: 4201851 pcs
11.65ct Topaz
13.03 x 9.06mm
USD 81.55
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ID: 3758961 pcs
8.15ct Amethyst
12.96 x 6.75mm
USD 40.75
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ID: 4165141 pcs
6.07ct Star Moonstone
12.68 x 5.51mm
USD 24.28
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ID: 3925172 pcs
19.98ctw Amethyst
13.30 x 8.28mm
USD 99.90
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ID: 4080971 pcs
6.57ct Smoky Quartz
12.82 x 8.78mm
USD 11.76
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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