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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (140): Round Shape 3 mm Gems Clear All
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ID: 38539320 pcs
thumb image of 2.5ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385393)
2.50 ct Demantoid Garnet
2.9 mm
$ 174.18
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ID: 38035720 pcs
thumb image of 2.4ct Diamond-Cut Green Tsavorite Garnet (ID: 380357)
2.38 ct Tsavorite Garnet
3.1 mm
$ 218.56
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ID: 38553220 pcs
thumb image of 2.7ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385532)
2.67 ct Demantoid Garnet
3 mm
$ 186.10
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ID: 41868620 pcs
thumb image of 2.3ct Diamond-Cut Multicolor Sapphire (ID: 418686)
2.32 ct Sapphire
2.9 mm
$ 81.20
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ID: 40928610 pcs
thumb image of 1.4ct Diamond-Cut Pink Sapphire (ID: 409286)
1.38 ct Sapphire
3 mm
$ 48.30
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ID: 40196810 pcs
thumb image of 1.3ct Diamond-Cut Pink Red Ruby (ID: 401968)
1.34 ct Ruby
2.9 mm
$ 186.13
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ID: 38563920 pcs
thumb image of 2.4ct Diamond-Cut Golden Green Demantoid Garnet (ID: 385639)
2.43 ct Demantoid Garnet
3.1 mm
$ 169.37
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ID: 40943010 pcs
thumb image of 1.3ct Diamond-Cut Pink Sapphire (ID: 409430)
1.32 ct Sapphire
3 mm
$ 59.40
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ID: 4295276 pcs
thumb image of 0.7ct Round Facet Green Emerald (ID: 429527)
0.74 ct Emerald
3.1 mm
$ 259.00
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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: 40936510 pcs
thumb image of 1.3ct Diamond-Cut Pink Sapphire (ID: 409365)
1.29 ct Sapphire
3 mm
$ 45.15
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ID: 40217010 pcs
thumb image of 1.5ct Diamond-Cut Pink Red Ruby (ID: 402170)
1.51 ct Ruby
3.1 mm
$ 209.74
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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: 40948010 pcs
thumb image of 1.3ct Diamond-Cut Multicolor Sapphire (ID: 409480)
1.31 ct Sapphire
3 mm
$ 45.85
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ID: 38192620 pcs
thumb image of 2.5ct Diamond-Cut Multicolor Andalusite (ID: 381926)
2.50 ct Andalusite
3.1 mm
$ 100.22
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ID: 40966410 pcs
thumb image of 1.4ct Diamond-Cut Multicolor Sapphire (ID: 409664)
1.42 ct Sapphire
3 mm
$ 49.70
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ID: 40210710 pcs
thumb image of 1.6ct Diamond-Cut Pink Red Ruby (ID: 402107)
1.64 ct Ruby
3.1 mm
$ 227.80
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ID: 40901610 pcs
thumb image of 1.4ct Diamond-Cut Multicolor Sapphire (ID: 409016)
1.44 ct Sapphire
3.1 mm
$ 50.40
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ID: 38036120 pcs
thumb image of 2.9ct Diamond-Cut Green Tsavorite Garnet (ID: 380361)
2.90 ct Tsavorite Garnet
3 mm
$ 266.31
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ID: 40207415 pcs
thumb image of 2ct Diamond-Cut Pink Red Ruby (ID: 402074)
2.04 ct Ruby
3 mm
$ 283.36
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ID: 38639510 pcs
thumb image of 1.5ct Diamond-Cut Golden Green Demantoid Garnet (ID: 386395)
1.52 ct Demantoid Garnet
3.1 mm
$ 106.08
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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