Calibrated 12 x 12 mm Square Shape Loose Natural Gemstones from Ge...

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.

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purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

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The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

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Gemstones A-Z

Buy Square Shape 12x12 mm Gems

10.2 ct Baguette Labradorite, 10.2 x 8.2 mm From Madagascar

15.48 ct Loose Pear Bloodstone, 28.8 x 16.5 mm From Madagascar

11.69 ct Loose Pear Charoite, 24.5 x 11.9 mm From Russia

0.5 carat Yellow Beryl, Pear Shape loose Beryl from Madagascar, Natural Untreated Gem, 6.9 x 4.6 mm

1.01 carat Pink Morganite, Pear Shape loose Morganite from Brazil, Natural Untreated Gem, 8.6 x 5.3 mm

3.1 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.1 x 3.2 mm

0.19 ct White Diamond, 2.9 mm Diamond Cut From India

8.38 ct Pink Morganite, 15.9 x 12 mm Oval Cut From Afghanistan

6.82 ct Odd Shaped Hemimorphite Druzy, 14.6 x 10.5 mm From Congo

2.29 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 6 x 4 mm

1.92 ct Oval Cut Kornerupine, 8.9 x 6.4 mm From Sri Lanka

1 ct Yellow Beryl, 8 x 6.1 mm Oval Cut From Madagascar

7.8 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 14.9 mm

9.37 ct Oval Malachite, 12.2 x 10.1 mm From Congo

3.79 ct Diamond Cut Andalusite, 3.7 mm From Brazil

0.96 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.8 x 5.2 mm

0.35 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6 x 4 mm

1.43 ct Purple Spinel, 7.5 x 5.6 mm Oval Cut From Tanzania

6.37 ct Oval Concave Cut Smoky Quartz, 14.1 x 12.2 mm From Brazil

3.98 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.9 x 4.9 mm

5.04 ct Orange Sunstone, 12.1 x 10.1 mm Oval Cut From India

3.84 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4.1 mm

17.98 ct Loose Pear Cut Amethyst, 21.2 x 16.1 mm From Brazil

1.64 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 4.7 mm

3.85 ct Red Andesine Labradorite, 11.3 x 9.2 mm Oval Cut From Congo

24.21 ct Blue Sodalite, 35.7 x 9.5 mm Pencil Cut From Australia

5.96 carat Pear Larimar, loose Certified Larimar from the Dominican Republic, Natural Untreated Gem, 17.6 x 11.8 mm

12.33 ct Baguette Malachite, 12.2 x 10.2 mm From Congo

1.18 ct Oval Black Opal, 9 x 7 mm From Ethiopia

1.57 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.5 x 3.6 mm

0.55 ct Loose Orange Sapphire, 4.5 x 4.5 mm Cushion Cut From Tanzania

3.95 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 7.2 mm

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