Buy 12 mm Round Calibrated Gemstones from GemSelect

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 Round shapes, facet cut and cabochon gems available now in 12 mm diameter 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 usually 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

I purchase all of my stones from GemSelect! They're the best I've found for both selection and value.

Posted By Terry in June, 2023

Source: Bizrate

Overall Rating -> 10

GemSelect has the Best gems. Clear photos and detailed description helps me make the best choice. I have Never been disappointed by thier quality items.

Posted By Rock Hound in July, 2023

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Overall Rating -> 10

Gem Select has gems at afffordable prices.

Posted By George in March, 2024

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Overall Rating -> 10

Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

Posted By C.J. in February, 2024

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Overall Rating -> 10

all good

Posted By John in December, 2023

Source: Bizrate

Overall Rating -> 10

Great selection of various gems, easy to navigate site

Posted By Josh in August, 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 Good

Posted By Julian in July, 2023

Source: Bizrate

Overall Rating -> 10

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

Source: Bizrate

Overall Rating -> 7

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023

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Overall Rating -> 10

Great selection and excellent website.

Posted By JBW in October, 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

Source: Bizrate

Overall Rating -> 10

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 2023

Source: Bizrate

Overall Rating -> 10

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

Posted By ChiChi in January, 2024

Source: Bizrate

Overall Rating -> 10

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.

Posted By Ktreva52 in February, 2024

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 12 mm Gems

21.17 ct Loose Blue Green Turquoise, 19.3 x 15.7 mm Oval Cut From the United States

18.22 carat Heart Prehnite, loose Certified Prehnite from South Africa, Natural Untreated Gem, 17.1 x 15.6 mm

0.33 ct Oval Cut Kornerupine, 4.9 x 3.7 mm From Sri Lanka

1.4 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

13.31 ct Asscher Cut Rose Quartz, 14.5 x 14.2 mm From South Africa

11.33 ct Blue Green Turquoise, 15.5 x 13.4 mm Oval Cut From the United States

1.24 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gem, 6 mm

25.32 ct Drilled Sphere Rutile Quartz, 9 mm From India

3.71 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 10.1 x 8.2 mm

0.91 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6 x 4.2 mm

2 ct Oval Prehnite, 7.7 x 6.8 mm From South Africa

0.61 carat Yellow Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6 x 4.1 mm

2.73 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.2 mm

1.39 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Tanzania, Natural Untreated Gem, 7.4 x 6 mm

0.85 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 5 mm

26.45 ct Baguette Jasper, 24.7 x 14.4 mm From Indonesia

1.85 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.8 x 6 mm

1.27 ct Loose Orange Moonstone, 10.2 x 4.9 mm Marquise Cut From India

9.66 ct Round Checkerboard Labradorite, 12.2 mm From Madagascar

3.99 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 10.6 x 8.3 mm

1.85 carat Orange Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 8 x 6.1 mm

11.48 ct Loose Oval Lapis Lazuli, 14.7 x 11.1 mm From Afghanistan

2.08 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.4 mm

47.67 ct Oval Jasper, 38.3 x 25.9 mm From Indonesia

6.53 ct Pink Kunzite, 10.7 x 9.8 mm Octagon Cut From Afghanistan

44.65 ct Oval Rose Quartz, 25.1 x 21.4 mm From South Africa

1.21 carat Purple Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Untreated Gem, 7.4 x 5.4 mm

2.59 ct Oval Tiger's Eye, 7.9 x 6 mm From Thailand

1.52 ct Blue Apatite, 5 x 4.1 mm Oval Cut From Madagascar

1.06 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Madagascar, Natural Untreated Gems, 4.2 x 4.1 mm

44.34 ct Oval Rose Quartz, 25.9 x 19.6 mm From South Africa

10.39 carat Bi-color Ametrine, Oval loose Ametrine from Brazil, Natural Untreated Gem, 16.5 x 12.7 mm

Gemstone Information

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Gemstone EDUCATION

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