Calibrated 12 x 10 mm Oval Shape Natural Loose Gemstones: 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 oval shapes, facet cut and cabochon gems available now in 12 x 10 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 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 round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most 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

Excellent site.

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Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B 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

I enjoyed browsing though different varieties of rubies. I felt that the experience was simple and easy to navigate!

Posted By Daws in July, 2023

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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

Easy to navigate

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Overall Rating -> 10

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

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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

Selection ability was straightforward and easy.

Posted By Dave in May, 2023

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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 -> 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!

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023

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Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

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Overall Rating -> 10

Overall, the whole process was just great.

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Overall Rating -> 10

My overall interaction with your website was pleasant, as always.

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Gemstones A-Z

Buy Oval Shape 12x10 mm Gems

1.82 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 18.3 x 3.5 mm

13.35 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 18.4 x 11 mm

1.15 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.1 x 5.2 mm

7.9 ct Oval Tiger's Eye, 12.3 x 8.3 mm From Thailand

1.25 ct Oval Black Opal, 9.2 x 7 mm From Ethiopia

2.21 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 6.2 x 4.4 mm

6.95 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 10.1 x 8.1 mm

16.39 carat Pear Shape Ammolite, loose Certified Ammolite from Canada, Natural Gem, 22.5 x 17.4 mm

1.78 ct Oval Strawberry Quartz, 8.1 x 6.2 mm From Russia

1.34 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7 x 6.2 mm

16.28 ct Loose Pink Kunzite, 15.1 x 11.8 mm Octagon Cut From Afghanistan

0.44 ct Loose Orange Sapphire, 5 x 2.6 mm Marquise Cut From Tanzania

0.96 ct Octagon Cut Peridot, 7 x 5.1 mm From China

1.5 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5 mm

7.48 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.9 x 10.1 mm

1.48 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 9 x 6.6 mm

1.63 ct Oval Sillimanite Cat's Eye, 7.2 x 5.3 mm From Madagascar

4.79 carat Sky Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 8.1 mm

10.83 carat Pear Rainbow Moonstone, loose Certified Rainbow Moonstone from the United States, Natural Untreated Gem, 22.8 x 10.3 mm

5.31 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10 x 9.9 mm

0.16 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.3 mm

1.29 ct Oval Sillimanite Cat's Eye, 7.3 x 5.2 mm From Madagascar

3.39 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 10 mm

7.76 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8 x 6 mm

19.68 ct Oval Onyx, 25.1 x 18.1 mm From Sri Lanka

1.67 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

6.18 ct Oval Malachite, 12.2 x 10.2 mm From Congo

22.19 ct Brown Moonstone, 22.1 x 16 mm Oval Cut From India

1.17 ct Blue Kyanite, 7.1 x 5.1 mm Oval Cut From Nepal

5.04 ct Orange Sphalerite, 11 x 7.4 mm Octagon Cut From Congo

6.66 ct Yellow Apatite, 13.9 x 11 mm Oval Cut From Madagascar

5.76 ct Orange Sunstone, 8.9 mm Round Cut From India

Gemstone Information

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