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Buy Square Shape 12x12 mm Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (18): Square Shape 12x12 mm Gems Clear All
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Black Spinel Gem - 7.9ct Square Rose-Cut (ID: 381325)

Square Black Spinel

7.89 ct (total 15.78ctw)
11.9 x 11.9 mm
$ 23.67
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Black Spinel Gem - 8ct Square Rose-Cut (ID: 381326)

Square Black Spinel

8.04 ct (total 16.07ctw)
11.8 x 11.8 mm
$ 24.10
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Black Spinel Gem - 8.2ct Square Rose-Cut (ID: 381370)

Square Black Spinel

8.24 ct (total 16.47ctw)
12 x 11.8 mm
$ 24.70
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Black Spinel Gem - 8.3ct Square Rose-Cut (ID: 381369)

Square Black Spinel

8.31 ct (total 16.62ctw)
11.9 x 11.6 mm
$ 24.93
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Green Maw-Sit-Sit Gem - 8.6ct Square Sugarloaf Cabochon (ID: 476905)

Square Green Maw-Sit-Sit

8.6ct
11.9 x 11.9 mm
$ 25.80
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Black Spinel Gem - 7.7ct Square Rose-Cut (ID: 381322)

Square Black Spinel

7.71 ct (total 15.42ctw)
11.7 x 11.6 mm
$ 23.13
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Multicolor Green Malachite Gem - 15.8ct Square Sugarloaf Cabochon (ID: 342100)

Square Green Malachite

15.8ct
12.2 x 12.1 mm
$ 20.51
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Green Bloodstone Gem - 8.4ct Square Sugarloaf Cabochon (ID: 474364)

Square Green Bloodstone

8.4ct
12.1 x 12 mm
$ 25.14
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Light Pink Rose Quartz Gem - 9.3ct Princess-Cut (ID: 504623)

Square Pink Rose Quartz

9.3ct
12.3 x 12.3 mm
$ 28.08
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Pink Rose Quartz Gem - 7.8ct Princess-Cut (ID: 414694)

Square Pink Rose Quartz

7.8ct
11.8 x 11.6 mm
$ 39.05
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Black Spinel Gem - 8.1ct Square Rose-Cut (ID: 379232)

Square Black Spinel

8.09 ct (total 16.18ctw)
12 x 11.8 mm
$ 48.54
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Black Spinel Gem - 7.9ct Square Rose-Cut (ID: 379228)

Square Black Spinel

7.94 ct (total 15.88ctw)
11.8 x 11.7 mm
$ 47.64
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Pink Rose Quartz Gem - 7.7ct Princess-Cut (ID: 414766)

Square Pink Rose Quartz

7.7ct
11.7 x 11.7 mm
$ 38.50
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Pink Rose Quartz Gem - 9.2ct Princess-Cut (ID: 414568)

Square Pink Rose Quartz

9.2ct
12.1 x 12 mm
$ 45.75
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2 pcs
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Black Spinel Gem - 8.3ct Square Rose-Cut (ID: 379230)

Square Black Spinel

8.32 ct (total 16.63ctw)
11.7 x 11.7 mm
$ 59.99
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Black Spinel Gem - 7.9ct Square Rose-Cut (ID: 379001)

Square Black Spinel

7.90 ct (total 15.79ctw)
11.8 x 11.7 mm
$ 47.37
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Black Spinel Gem - 7.8ct Square Rose-Cut (ID: 378997)

Square Black Spinel

7.77 ct (total 15.54ctw)
11.8 x 11.8 mm
$ 46.62
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1 pc
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Pink Rose Quartz Gem - 9.8ct Princess-Cut (ID: 414698)

Square Pink Rose Quartz

9.8ct
12.1 x 12.1 mm
$ 48.90
Item in Stock
Square Shape 12x12 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 Square shapes, facet cut and cabochon gems available now in 12 mm x 12 mm 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 meant nor 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.

Certified Customer Reviews
Overall Rating -> 10 star ratings
I was very happy on the quality of the gemstones I recieved from GemSelect, I will deffinetly buy again.
Posted By Mckeg in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great, easy to use, efficient!
Posted By Olive in January, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
Great selection. Love the many learning features like articles and gem information. Prices competitive for natural stones. I do miss not having a selection of lab-made stones, CZ’s, etc, which are useful when price and cost are factors.
Posted By Dirk in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Website easy to navigate.
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
Source: Bizrate
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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