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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (216): Round Shape 3 mm Gems Clear All
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ID: 46780610 pcs
thumb image of 1.9ct Round Cabochon Red Almandine Garnet (ID: 467806)
1.92 ct Almandine Garnet
3 mm
$ 9.60
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ID: 47386010 pcs
thumb image of 1.3ct Round Facet Green Chrome Diopside (ID: 473860)
1.25 ct Chrome Diopside
3 mm
$ 18.75
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ID: 4680396 pcs
thumb image of 0.9ct Round Cabochon Blue White Rainbow Moonstone (ID: 468039)
0.90 ct Rainbow Moonstone
2.9 mm
$ 9.00
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ID: 47870210 pcs
thumb image of 1.3ct Round Facet Green Chrome Diopside (ID: 478702)
1.25 ct Chrome Diopside
2.9 mm
$ 18.75
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ID: 46897910 pcs
thumb image of 1.4ct Diamond-Cut Golden Green Demantoid Garnet (ID: 468979)
1.40 ct Demantoid Garnet
3 mm
$ 56.00
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ID: 46788410 pcs
thumb image of 2.1ct Round Cabochon Deep Red Almandine Garnet (ID: 467884)
2.06 ct Almandine Garnet
3.1 mm
$ 10.30
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ID: 46780510 pcs
thumb image of 1.9ct Round Cabochon Red Almandine Garnet (ID: 467805)
1.87 ct Almandine Garnet
3.1 mm
$ 9.35
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ID: 47386310 pcs
thumb image of 1.3ct Round Facet Green Chrome Diopside (ID: 473863)
1.32 ct Chrome Diopside
3 mm
$ 19.80
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ID: 46897310 pcs
thumb image of 1.6ct Diamond-Cut Golden Green Demantoid Garnet (ID: 468973)
1.55 ct Demantoid Garnet
3.1 mm
$ 62.00
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ID: 46788710 pcs
thumb image of 2.1ct Round Cabochon Red Almandine Garnet (ID: 467887)
2.09 ct Almandine Garnet
3.1 mm
$ 10.45
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ID: 46780010 pcs
thumb image of 2.1ct Round Cabochon Red Almandine Garnet (ID: 467800)
2.09 ct Almandine Garnet
3.1 mm
$ 10.45
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ID: 40225015 pcs
thumb image of 2ct Diamond-Cut Pink Red Ruby (ID: 402250)
1.95 ct Ruby
3 mm
$ 270.86
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ID: 4680998 pcs
thumb image of 1ct Round Cabochon Blue White Rainbow Moonstone (ID: 468099)
1.03 ct Rainbow Moonstone
3 mm
$ 10.30
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ID: 46780310 pcs
thumb image of 1.8ct Round Cabochon Red Almandine Garnet (ID: 467803)
1.78 ct Almandine Garnet
3 mm
$ 8.90
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ID: 34472720 pcs
thumb image of 3ct Round Cabochon Pink Sapphire (ID: 344727)
3.03 ct Sapphire
3.1 mm
$ 75.75
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ID: 46883510 pcs
thumb image of 1.7ct Diamond-Cut Golden Green Demantoid Garnet (ID: 468835)
1.66 ct Demantoid Garnet
3.1 mm
$ 66.40
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ID: 46779910 pcs
thumb image of 2ct Round Cabochon Red Almandine Garnet (ID: 467799)
2.01 ct Almandine Garnet
3.1 mm
$ 10.05
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ID: 38223630 pcs
thumb image of 3.8ct Diamond-Cut Multicolor Andalusite (ID: 382236)
3.81 ct Andalusite
3.1 mm
$ 152.90
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ID: 46808510 pcs
thumb image of 1.4ct Round Cabochon Blue White Rainbow Moonstone (ID: 468085)
1.44 ct Rainbow Moonstone
3 mm
$ 14.40
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ID: 46882610 pcs
thumb image of 1.8ct Diamond-Cut Golden Green Demantoid Garnet (ID: 468826)
1.75 ct Demantoid Garnet
3.1 mm
$ 70.00
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ID: 47386710 pcs
thumb image of 1.3ct Round Facet Green Chrome Diopside (ID: 473867)
1.25 ct Chrome Diopside
3 mm
$ 18.75
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Round Shape 3 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 3 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