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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Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

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Overall Rating -> 10

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

Posted By JamesMichael781 in September, 2023

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Overall Rating -> 10

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 2023

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Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

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Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

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Overall Rating -> 9

An it was good.

Posted By Miguel in June, 2023

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023

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Overall Rating -> 10

Everything fine.

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

Posted By Fl_Beachcomber in October, 2023

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

Posted By APPS in April, 2024

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Overall Rating -> 10

The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

Posted By Jrplunk in April, 2024

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Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

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Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

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Overall Rating -> 10

The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

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Gemstones A-Z

Buy Square Shape 12x12 mm Gems

4.58 ct Yellow Quartz, 11.2 x 10.9 mm Flower Cut From Brazil

0.02 ct Loose Blue Diamond, 1.9 mm Diamond Cut From India

2.1 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.3 x 9.2 mm

1.96 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 9.2 mm

14.05 ct Pink Moonstone, 10 x 9.9 mm Carved From India

0.43 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.1 x 3.2 mm

3.49 carat Pink Tourmaline, Cushion Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 10.7 x 7.9 mm

2.62 ct Blue Green Grandidierite, 9.3 x 8 mm Oval Cut From Madagascar

6.73 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 19.1 x 12.1 mm

1.92 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gem, 10.2 x 7.1 mm

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

42.48 ct Cushion Chrysocolla, 28.2 x 22.2 mm From Australia

2.97 ct Blue Star Sapphire, 6.7 x 5 mm Oval Cut From Thailand

4.16 ct Round Cut Strawberry Quartz, 10.9 mm From Russia

10.82 ct Ball Agate, 11.1 mm From Indonesia

6.84 carat Bi-color Ametrine, Oval loose Ametrine from Brazil, Natural Untreated Gem, 15.8 x 10.2 mm

1.39 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

2.81 ct Loose Cushion Mystic Quartz, 7.1 x 7.1 mm From Brazil

1.44 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.9 x 5.1 mm

3.16 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 7 mm

5.08 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.1 x 10 mm

2.13 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18.6 x 3.8 mm

55.96 ct Oval Jasper, 43.2 x 22.6 mm From Indonesia

18.01 carat Green Aventurine, Pear loose Aventurine from Brazil, Natural Untreated Gem, 23.8 x 20.4 mm

2.41 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10 x 5.1 mm

1.22 carat Green Tourmaline, Baguette Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 7.7 x 5 mm

0.46 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gem, 6 x 4 mm

2.31 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 8.9 x 8.9 mm

19.6 carat Round Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 mm

4.23 ct Oval Cat's Eye Opal, 13.5 x 8 mm From Madagascar

5.98 ct Oval Coral, 15.2 x 11.3 mm From Indonesia

4.4 ct Carved Prehnite, 13.8 x 10 mm From South Africa

Gemstone Information

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