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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it was good

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

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Overall Rating -> 10

My first order. I am anxious to see if what I ordered is what I receive.

Posted By KRJ in July, 2023

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Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

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Overall Rating -> 10

I love GemSelect, photos and details are great.

Posted By #1 in February, 2024

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Overall Rating -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Overall Rating -> 10

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

Posted By Meow in June, 2023

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Overall Rating -> 10

I enjoyed browsing though different varieties of rubies. I felt that the experience was simple and easy to navigate!

Posted By Daws in July, 2023

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Overall Rating -> 10

Great Job today! No issues!

Posted By Samlovesgems777 in August, 2023

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Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

Posted By Jf in January, 2024

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Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

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Overall Rating -> 10

Great experience! First time buyer

Posted By Todi89 in February, 2024

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Overall Rating -> 9

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

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Gemstones A-Z

Buy Square Shape 12x12 mm Gems

2.94 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.9 mm

0.82 ct Loose Orange Sapphire, 6.5 x 4.9 mm Oval Cut From Madagascar

1.18 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.2 x 6.6 mm

2.1 ct Round Strawberry Quartz, 6.8 mm From Russia

0.57 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.5 x 4.5 mm

7.24 ct Green Agate, 13.4 x 12 mm Oval Cut From India

0.16 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.4 mm

1.23 ct Yellow Beryl, 7.2 mm Round Cut From Brazil

3.07 ct Yellow Quartz, 11.2 x 11.2 mm Carved From Brazil

1.54 ct Green Sphene, 6.9 x 6.1 mm Oval Cut From Sri Lanka

0.47 ct Orange Sphalerite, 4.4 mm Round Cut From Spain

3.54 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.9 mm

8.1 ct Green Amazonite, 7.3 x 7.2 mm Cushion Cut From Madagascar

1.97 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.9 x 6 mm

0.67 carat Blue Tanzanite, Marquise Cut loose Tanzanite from Tanzania, Natural Gems, 7.1 x 3.6 mm

18.63 ct Carved Prehnite, 14.6 x 10.3 mm From South Africa

12.13 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 17.4 x 13.2 mm

0.8 ct Octagon Cut Color-Change Diaspore, 6.7 x 5.2 mm From Turkey

5.09 ct Round Prehnite, 7.9 mm From South Africa

1.99 ct Loose Princess Cut Sapphire, 2.4 x 2.3 mm From Tanzania

1.88 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18.6 x 3.7 mm

2.38 ct Orange Sunstone, 8.6 mm Round Cut From India

1.57 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.5 x 3.4 mm

2.11 carat Yellow Citrine, Carved Flower loose Citrine from Brazil, Natural Untreated Gem, 8.2 x 8.1 mm

1.13 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.9 x 3 mm

17.67 ct Oval Star Ruby, 15.4 x 12.8 mm From Madagascar

1.6 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gem, 7.1 mm

1.5 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5.1 mm

1.1 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.4 x 3.3 mm

21.47 ct Cushion Rose Cut Lapis Lazuli, 22.1 x 21.6 mm From Afghanistan

8.92 ct Fancy Fire Agate, 15.5 x 11.8 mm From Mexico

16.25 ct Fancy Charoite, 21.2 x 14.1 mm From Russia

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