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

Everything was fine.

Posted By Matt in March, 2024

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Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber 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

Was easy to search for many gems and mineral stones.Authenticity of natural stones is important, and I feel this site offers some assurance on this.

Posted By DanM in November, 2023

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Overall Rating -> 10

I loved the opportunity to shop on a website that I could trust 👍

Posted By Will J. Lover in September, 2023

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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

Source: Bizrate

Overall Rating -> 10

Great website and information

Posted By Moonshot in December, 2023

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Overall Rating -> 10

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023

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Overall Rating -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

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Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

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Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 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

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Overall Rating -> 10

I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

Posted By Apps in November, 2023

Source: Bizrate

Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

Posted By Orchidisle in February, 2024

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Gemstones A-Z

Buy Round Shape 12 mm Gems

3.21 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 8 x 6.1 mm

11.5 carat Pink Kunzite, Pear Shape loose Kunzite from Afghanistan, Natural Untreated Gem, 19.5 x 10.1 mm

3.13 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10 mm

0.2 ct Black Diamond, 2.8 x 2.8 mm Princess Cut From India

0.8 carat Red Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 6 x 4.7 mm

4.96 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8.1 mm

1.22 ct Loose Round Cut Smoky Quartz, 7.1 mm From Brazil

1.04 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12 x 4.2 mm

4.42 ct Pink Kunzite, 10.2 x 7.6 mm Octagon Cut From Afghanistan

11.38 ct Yellow Quartz, 16.1 mm Round Concave Cut From Brazil

6.73 ct Odd Shaped Druzy Variscite, 24.8 x 12.1 mm From China

6.22 ct Marquise Boulder Opal, 25.4 x 9.6 mm From Australia

27.79 carat Pear Tiger's Eye Matrix, loose Certified Tiger's Eye Matrix from Mexico, Natural Untreated Gem, 34.2 x 18.5 mm

15.18 carat Pear Checkerboard Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gems, 18.2 x 12.9 mm

2.8 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 5.9 x 4 mm

1.13 ct Violet Spinel, 6.4 x 5.6 mm Oval Cut From Tanzania

1.09 ct Loose Pear Cut Mystic Quartz, 8.1 x 6 mm From Brazil

3.32 carat Sky Blue Topaz, Princess-Cut loose Topaz from Brazil, Natural Gem, 8.3 x 8.3 mm

1.37 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.1 x 6 mm

1.14 ct Blue Kyanite, 7.2 x 5.2 mm Oval Cut From Nepal

6.32 carat Pink Topaz, Round loose Topaz from Brazil, Natural Gem, 11.1 mm

1.12 ct Green Sphene, 6.7 x 5.3 mm Oval Cut From Sri Lanka

0.44 ct Round Chrysoberyl Cat's Eye, 3.9 mm From Sri Lanka

3.63 carat Pear Larimar, loose Certified Larimar from the Dominican Republic, Natural Untreated Gem, 13 x 9.1 mm

11.89 ct Loose Pear Labradorite, 18.2 x 13.2 mm From Madagascar

8.03 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.9 x 10 mm

46.55 ct Heart Hematite, 19.1 x 20.3 mm From Brazil

50.61 ct Fancy Larimar, 30.1 x 26 mm From the Dominican Republic

2.65 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

0.97 ct Oval Cat's Eye Moonstone, 7 x 5 mm From India

2.21 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.2 x 5.3 mm

4.94 ct Oval Tiger's Eye, 10.8 x 8.4 mm From Thailand

Gemstone Information

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