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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (325): Round Shape 13 mm Gems Clear All
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ID: 4039631 pcs
6.12ct Rutile Quartz
12.99mm x 4.96mm
USD 24.48
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ID: 4033911 pcs
8.41ct Rutile Quartz
13.24mm x 6.51mm
USD 26.66
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ID: 4040721 pcs
6.89ct Rutile Quartz
12.69mm x 5.58mm
USD 27.56
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ID: 4079681 pcs
6.77ct Smoky Quartz
12.49mm x 9.76mm
USD 12.12
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ID: 4080121 pcs
7.47ct Smoky Quartz
12.99mm x 9.91mm
USD 13.37
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ID: 4040681 pcs
6.33ct Rutile Quartz
12.78mm x 5.17mm
USD 25.32
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ID: 3381491 pcs
13.95ct Pearl
12.55mm
USD 209.25
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ID: 4076461 pcs
12.13ct Maw-Sit-Sit
13.45mm x 8.43mm
USD 24.26
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ID: 3925972 pcs
18.92ctw Amethyst
12.93mm x 7.91mm
USD 94.60
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ID: 3350521 pcs
10.33ct Ruby-Zoisite
13.01mm x 7.39mm
USD 20.66
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ID: 4014371 pcs
7.41ct Quartz
12.48mm x 9.70mm
USD 37.05
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ID: 4087761 pcs
6.40ct Quartz
12.51mm x 8.99mm
USD 9.92
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ID: 4353061 pcs
13.94ct Rutile Quartz
12.59mm
USD 13.94
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ID: 4083731 pcs
8.14ct Quartz
13.22mm x 10.34mm
USD 12.62
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ID: 3514621 pcs
9.91ct Quartz Cat's Eye
13.15mm x 7.71mm
USD 39.64
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ID: 3606121 pcs
8.80ct Quartz Cat's Eye
13.06mm x 7.57mm
USD 35.20
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ID: 4087401 pcs
6.90ct Quartz
13.01mm x 9.14mm
USD 10.70
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ID: 3697191 pcs
8.92ct Quartz Cat's Eye
13.07mm x 7.26mm
USD 28.90
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ID: 4201941 pcs
8.79ct Topaz
13.04mm x 7.17mm
USD 61.53
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ID: 4039561 pcs
7.58ct Rutile Quartz
13.16mm x 5.75mm
USD 30.32
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ID: 4087431 pcs
6.83ct Quartz
12.91mm x 9.01mm
USD 10.59
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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