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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I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

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

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Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

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I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

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Gemstones A-Z

Buy Square Shape 12x12 mm Gems

24.87 carat Pear Moss Agate, loose Certified Moss Agate from India, Natural Untreated Gem, 30.6 x 20.3 mm

2.08 carat Emerald Cut Emerald, loose Certified Emerald from Zambia, Natural Gem, 8.3 x 6.5 mm

19.02 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 17.7 x 17.1 mm

8.07 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10.1 mm

0.41 carat Purple Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 7.2 x 3.8 mm

8.1 ct Oval Actinolite Cat's Eye, 15 x 12.2 mm From the United States

14.08 ct Green Aventurine, 25.8 x 16.9 mm Oval Cut From Brazil

0.75 ct Loose Trillion Cut Mystic Quartz, 6 x 5.9 mm From Brazil

2.98 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9.6 x 8.1 mm

0.68 carat Green Sapphire, Trillion-Cut loose Sapphire from Madagascar, Natural Gem, 5.3 x 5.1 mm

3.61 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.1 x 9 mm

19.64 carat Pear Ruby-Zoisite, loose Certified Ruby-Zoisite from Tanzania, Natural Untreated Gem, 20.2 x 14.1 mm

0.73 ct Loose Pink Sapphire, 6.2 x 5.1 mm Oval Cut From Madagascar

5.86 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16 x 11.8 mm

3.71 ct Asscher Cut Smoky Quartz, 9.5 x 9.4 mm From Brazil

0.9 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 6.9 x 6.8 mm

13.67 ct Oval Star Ruby, 14 x 12.1 mm From Madagascar

1.63 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

0.7 ct Loose Yellow Sapphire, 4.6 x 4.6 mm Cushion Cut From Tanzania

3.24 ct Orange Sunstone, 7.2 x 5.2 mm Oval Cut From Russia

0.8 ct Yellow Sphalerite, 5.9 x 4.9 mm Oval Cut From Spain

17.46 carat Cameo Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 25.1 mm

0.16 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

4.42 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

8.75 ct Gray Jadeite, 15.1 x 12.4 mm Oval Cut From Myanmar

2.05 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gem, 12 x 6 mm

2.86 ct Loose Yellow Sapphire, 4.8 mm Round Cut From Tanzania

1.23 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7 x 5.2 mm

2.24 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.3 mm

1.36 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 9.9 x 5.1 mm

47.42 ct Oval Rose Quartz, 25.1 x 21.3 mm From South Africa

16.06 ct Loose Fancy Charoite, 25.9 x 12.7 mm From Russia

Gemstone Information

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