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

Found the stone I wanted which was delivered quickly and met expectations.

Posted By GemGrammy in January, 2024

Source: Bizrate

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).

Posted By Oakcityceo in May, 2023

Source: Bizrate

Overall Rating -> 10

Very detailed and great pictures

Posted By Alexandrite 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

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023

Source: Bizrate

Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 2023

Source: Bizrate

Overall Rating -> 10

I have received emails for about a year and today is the condition that had me decide on the purchase

Posted By Tim in April, 2024

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

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Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

Posted By Ray in February, 2024

Source: Bizrate

Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

Source: Bizrate

Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

Source: Bizrate

Overall Rating -> 10

I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

Posted By Phoenix in February, 2024

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 12 mm Gems

3.57 ct Loose Baguette Labradorite, 9.1 x 7.1 mm From Madagascar

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

11.8 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 18.2 x 13 mm

8.25 ct Oval Tiger's Eye, 13.4 x 12.1 mm From Thailand

14.58 ct Oval Tiger's Eye, 19.8 x 14.9 mm From Thailand

1.37 ct Yellow Beryl, 8.8 x 6.8 mm Oval Cut From Madagascar

0.5 ct Loose Orange Sapphire, 3.3 x 3.3 mm Princess Cut From Tanzania

0.46 ct Blue Kyanite, 3.6 mm Round Cut From Nepal

1.41 ct Loose Purple Sapphire, 4 x 3.9 mm Trillion Cut From Madagascar

14.67 ct Asscher Cut Rose Quartz, 15.2 x 15.1 mm From South Africa

0.92 ct Loose Oval Cut Black Opal, 8.5 x 6.6 mm From Ethiopia

3.65 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 11.8 x 6 mm

4.45 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 7.4 mm

5.56 ct Oval Cat's Eye Opal, 13 x 10.6 mm From Madagascar

20.45 ct Loose Oval Bloodstone, 22.4 x 14.1 mm From Madagascar

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

1.99 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gem, 8.2 x 6.1 mm

33.52 ct Yellow Quartz, 21.4 x 17.8 mm Oval Cut From Brazil

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

3.46 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 12.2 x 8.8 mm

5.23 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12 x 6 mm

1.11 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 7.1 x 5.1 mm

1.27 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gems, 5.2 x 5.1 mm

0.86 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 7.1 x 5.1 mm

2.32 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 6.8 x 5 mm

1.52 ct Oval Cut Rainbow Moonstone, 8.2 x 6.1 mm From the United States

3.69 ct Round Labradorite, 7.2 mm From Madagascar

1.29 ct Oval Black Opal, 9.1 x 7.2 mm From Ethiopia

2.13 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.5 mm

6.52 ct Black Star Sapphire, 11.8 x 9 mm Oval Cut From Thailand

2.5 ct Oval Cut Golden Beryl, 10.3 x 8.1 mm From Madagascar

1.97 ct Yellow Beryl, 9.8 x 7.6 mm Oval Cut From Madagascar

Gemstone Information

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