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

Pleasant.

Posted By Mk in November, 2023

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Overall Rating -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

Posted By Bob in November, 2023

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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

Convenient selection, arrival on time

Posted By Alin in February, 2024

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Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

Posted By Bikerwalrus in October, 2023

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Overall Rating -> 10

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

Posted By Jen in August, 2023

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Overall Rating -> 10

all good

Posted By John in December, 2023

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Overall Rating -> 10

Great experience! First time buyer

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Overall Rating -> 10

love yall

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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

It was easy to navigate and I hope that the gem is as nice as the picture

Posted By 1 in April, 2024

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Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

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Overall Rating -> 10

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024

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Overall Rating -> 10

Excellent site.

Posted By Boru in December, 2023

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Overall Rating -> 8

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

Posted By MI photo in May, 2023

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Gemstones A-Z

Buy Square Shape 12x12 mm Gems

1.32 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12.2 x 4.2 mm

3.76 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.9 mm

4.07 ct Pink Coral, 9.9 mm Carved From Australia

7.89 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 11.1 x 9 mm

0.67 ct Pink Spinel, 5.4 x 4.4 mm Cushion Cut From Tanzania

5.34 ct Round Rutile Quartz, 11.1 mm From India

1.67 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.3 x 4.3 mm

2.54 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 22.5 x 3.7 mm

0.48 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.1 x 3.1 mm

26.55 carat Black Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 25 x 14.2 mm

22.37 ct Oval Jasper, 26.9 x 19.5 mm From Indonesia

5.07 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.1 x 8.1 mm

1.97 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 7.5 x 7.3 mm

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

0.59 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 4.3 x 4.3 mm

12.36 ct Round Pietersite, 14.6 mm From Namibia

2.2 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.1 x 3 mm

27.3 ct Oval Bloodstone, 28.2 x 18.3 mm From Madagascar

0.18 ct Square Cut Iolite, 2.6 x 2.5 mm From Madagascar

11.24 ct Loose Pear Dendritic Agate, 19.5 x 15.1 mm From India

2 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 6 x 3.9 mm

10.71 ct Oval Star Ruby, 12 x 11 mm From Madagascar

2.25 ct Orange Sunstone, 8.3 x 6.2 mm Oval Cut From India

5.73 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.2 x 9.2 mm

5.53 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gems, 14 x 9.7 mm

2.68 ct Oval Prehnite, 9.3 x 8 mm From South Africa

1.96 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 6 mm

2.38 ct Round Cut Strawberry Quartz, 6.9 mm From Russia

0.81 ct Octagon Cut Color-Change Diaspore, 5.7 x 5 mm From Turkey

20.61 ct Brown Moonstone, 21.4 x 16.1 mm Oval Cut From India

1.67 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 11.1 x 8.5 mm

0.33 ct Loose Yellow Sapphire, 5 x 2.6 mm Marquise Cut From Tanzania

Gemstone Information

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