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Buy Round Shape 12 mm Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (573): Round Shape 12 mm Gems Clear All
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Silver Pearl Gem - 13ct Spherical (ID: 338171)

Sphere / Ball Gray Pearl

13ct
12.1 mm
$ 129.70
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Grayish Silver Star Sapphire Gem - 11ct Round Cabochon (ID: 470800)

Round Gray Star Sapphire

11ct
11.5 mm
$ 383.95
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Red Strawberry Quartz Gem - 5.9ct Round Facet (ID: 475301)

Round Red Strawberry Quartz

5.9ct
12 mm
$ 40.95
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2 pcs
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Green Prehnite Gem - 5.8ct Round Facet (ID: 248654)

Round Green Prehnite

5.78 ct (total 11.55ctw)
12 mm
$ 51.98
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White Quartz Cat's Eye Gem - 8.5ct Round Cabochon (ID: 360619)

Round White Quartz Cat's Eye

8.5ct
12.1 mm
$ 33.92
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White Quartz Cat's Eye Gem - 7.8ct Round Cabochon (ID: 360634)

Round White Quartz Cat's Eye

7.8ct
11.8 mm
$ 31.08
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Silver Pearl Gem - 13.6ct Spherical (ID: 338281)

Sphere / Ball Gray Pearl

13.6ct
12.4 mm
$ 204.30
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Golden Pearl Gem - 13ct Spherical (ID: 335849)

Sphere / Ball Yellow Pearl

13ct
12.3 mm
$ 265.74
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Silver Pearl Gem - 13.3ct Spherical (ID: 338211)

Sphere / Ball Gray Pearl

13.3ct
12.3 mm
$ 199.50
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Silver Pearl Gem - 13ct Spherical (ID: 338212)

Sphere / Ball Gray Pearl

13ct
12.3 mm
$ 195.60
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White Quartz Cat's Eye Gem - 8.4ct Round Cabochon (ID: 360624)

Round White Quartz Cat's Eye

8.4ct
12.2 mm
$ 33.56
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Deep Brown Cat's Eye Scapolite Gem - 9.1ct Round Cabochon (ID: 470428)

Round Brown Cat's Eye Scapolite

9.1ct
11.8 mm
$ 45.70
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Black Spinel Gem - 7.4ct Round Rose-Cut (ID: 438489)

Round Black Spinel

7.35 ct (total 14.70ctw)
12.1 mm
$ 44.10
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Multicolor Jasper Gem - 12.3ct Drilled Sphere (ID: 361821)

Sphere / Ball Multicolor Jasper

12.29 ct (total 24.57ctw)
12.2 mm
$ 24.57
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Multicolor Jasper Gem - 13.1ct Drilled Sphere (ID: 361823)

Sphere / Ball Multicolor Jasper

13.09 ct (total 26.18ctw)
12.3 mm
$ 26.18
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Multicolor Jasper Gem - 12.4ct Drilled Sphere (ID: 361817)

Sphere / Ball Multicolor Jasper

12.41 ct (total 24.81ctw)
12.3 mm
$ 24.81
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Multicolor Jasper Gem - 13ct Drilled Sphere (ID: 361815)

Sphere / Ball Multicolor Jasper

12.97 ct (total 25.94ctw)
12.3 mm
$ 25.94
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Multicolor Jasper Gem - 11.9ct Drilled Sphere (ID: 361826)

Sphere / Ball Multicolor Jasper

11.92 ct (total 23.84ctw)
12.1 mm
$ 23.84
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Lemon Quartz Gem - 5.2ct Round Checkerboard (double sided) (ID: 417688)

Round Yellow Quartz

5.22 ct (total 10.44ctw)
12 mm
$ 20.88
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Multicolor Jasper Gem - 12.6ct Drilled Sphere (ID: 361819)

Sphere / Ball Multicolor Jasper

12.61 ct (total 25.21ctw)
12.3 mm
$ 25.21
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Gold Brown Tiger's Eye Gem - 13ct Drilled Sphere (ID: 422962)

Sphere / Ball Brown Tiger's Eye

13.01 ct (total 26.02ctw)
12.2 mm
$ 20.82
Item in Stock
Round Shape 12 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 12 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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Posted By RaeRae in January, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
I WOULD RECOMMEND GEM SELECT.
Posted By BO in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
As Always never disappointed in any gemstone I purchase from this site. I have never had a problem. Thank-You Gemselect for offering such a comprehensive variety . I will continue to order from this site.
Posted By Brian in January, 2019
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Easy to find what i'm looking for on website, very clear, like photos
Posted By Lifter in January, 2019
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Overall Rating -> 10 star ratings
Better than what I expected. Beautifully cut gem!
Posted By in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Gem select is the most trustworthy web site for gems. What I see in the picture is exactly what I get. Size is indicated by carat weight, and not the picture size, as they are trying to give an up close view of the gem I am hoping to buy. It was so easy to find the stones I was looking for at a price I could afford.
Posted By Nan in January, 2019
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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