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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (121): Round Shape 3 mm Gems Clear All
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ID: 34710115 pcs
thumb image of 2.1ct Round Cabochon Multicolor Sapphire (ID: 347101)
2.05 ct Sapphire
2.9 mm
$ 51.25
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ID: 38664010 pcs
thumb image of 1.2ct Diamond-Cut Golden Green Demantoid Garnet (ID: 386640)
1.18 ct Demantoid Garnet
3 mm
$ 82.35
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ID: 38552520 pcs
thumb image of 2.6ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385525)
2.59 ct Demantoid Garnet
3 mm
$ 180.52
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ID: 36774810 pcs
thumb image of 1.5ct Diamond-Cut Orange Spessartite Garnet (ID: 367748)
1.47 ct Spessartite Garnet
2.9 mm
$ 40.47
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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: 38663610 pcs
thumb image of 1.3ct Diamond-Cut Golden Green Demantoid Garnet (ID: 386636)
1.26 ct Demantoid Garnet
3 mm
$ 87.94
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ID: 34494320 pcs
thumb image of 2.8ct Round Cabochon Pink Sapphire (ID: 344943)
2.75 ct Sapphire
3 mm
$ 68.75
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ID: 38583610 pcs
thumb image of 1.3ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385836)
1.28 ct Demantoid Garnet
3 mm
$ 89.13
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ID: 38232730 pcs
thumb image of 3.7ct Diamond-Cut Multicolor Andalusite (ID: 382327)
3.74 ct Andalusite
3.1 mm
$ 150.09
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ID: 38539520 pcs
thumb image of 2.4ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385395)
2.41 ct Demantoid Garnet
2.9 mm
$ 167.90
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ID: 34472420 pcs
thumb image of 3.1ct Round Cabochon Pink Sapphire (ID: 344724)
3.07 ct Sapphire
3 mm
$ 76.75
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ID: 38639210 pcs
thumb image of 1.3ct Diamond-Cut Golden Green Demantoid Garnet (ID: 386392)
1.33 ct Demantoid Garnet
3 mm
$ 92.82
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ID: 38233630 pcs
thumb image of 3ct Diamond-Cut Multicolor Andalusite (ID: 382336)
3.03 ct Andalusite
3.1 mm
$ 121.59
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ID: 38552420 pcs
thumb image of 2.6ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385524)
2.55 ct Demantoid Garnet
3 mm
$ 177.74
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ID: 38583810 pcs
thumb image of 1.4ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385838)
1.40 ct Demantoid Garnet
3.1 mm
$ 97.48
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ID: 34486120 pcs
thumb image of 3.1ct Round Cabochon Pink Sapphire (ID: 344861)
3.14 ct Sapphire
2.9 mm
$ 78.50
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ID: 40217210 pcs
thumb image of 1.4ct Diamond-Cut Pink Red Ruby (ID: 402172)
1.35 ct Ruby
3.1 mm
$ 187.52
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ID: 38639410 pcs
thumb image of 1.4ct Diamond-Cut Golden Green Demantoid Garnet (ID: 386394)
1.44 ct Demantoid Garnet
3.1 mm
$ 100.50
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ID: 4671362 pcs
thumb image of 0.2ct Diamond-Cut Light Yellow Diamond (ID: 467136)
0.23 ct Diamond
3 mm
$ 211.09
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ID: 38233330 pcs
thumb image of 3.5ct Diamond-Cut Multicolor Andalusite (ID: 382333)
3.52 ct Andalusite
3.1 mm
$ 141.26
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ID: 4671382 pcs
thumb image of 0.2ct Diamond-Cut Light Yellow Diamond (ID: 467138)
0.23 ct Diamond
3 mm
$ 211.09
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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