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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Gemstone Information

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

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Overall Rating -> 10

Always have good experience

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Overall Rating -> 10

Easy to use website, made it very easy to buy. Will shop here again.

Posted By Bjorn in January, 2024

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Overall Rating -> 10

Always an easy experience using Gem select.

Posted By Jeff in November, 2023

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Overall Rating -> 10

Perfect size I was looking for and great price

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Overall Rating -> 10

Love gemselect

Posted By Joshua Howard in March, 2024

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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 -> 9

Easy to use. Limited supply of higher quality gemstones.

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Overall Rating -> 10

great. thank you

Posted By Carrotroller in July, 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

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

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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

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

Posted By APPS in April, 2024

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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

The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

Posted By Jrplunk in April, 2024

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Gemstones A-Z

Buy Oval Shape 12x10 mm Gems

4.21 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 5.9 mm

1.18 carat Orange Hessonite Garnet, Baguette Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.9 x 4.7 mm

0.59 ct Loose Yellow Sapphire, 3.6 x 3.5 mm Princess Cut From Tanzania

3.35 carat Pear Prehnite, loose Certified Prehnite from South Africa, Natural Untreated Gem, 9.9 x 8.2 mm

48.14 ct Oval Rhodochrosite, 26.8 x 17.8 mm From South Africa

0.66 carat Cushion Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 5.2 x 5.1 mm

2.18 carat Red Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.4 mm

2.86 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.2 x 3.2 mm

7.26 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10 x 7.9 mm

9.33 ct Fancy Dendritic Agate, 19.4 x 13.6 mm From India

5.59 ct Round Rutile Quartz, 12 mm From India

3.88 ct Pink Kunzite, 10.3 x 7.2 mm Octagon Cut From Afghanistan

11.12 ct Oval Nuummite, 17.4 x 11.7 mm From India

43.03 ct Pencil Cut Obsidian, 39.5 x 11.5 mm From the United States

8.04 carat Sky Blue Topaz, Heart loose Topaz from Cambodia, Natural Gems, 10 x 10 mm

2.49 ct Cushion Cut Peridot, 9.6 x 7 mm From Myanmar

5.18 ct Orange Sunstone, 10.3 x 8.4 mm Oval Cut From India

23.57 ct Fancy Moss Agate, 32 x 14.8 mm From India

2.71 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.7 x 4.5 mm

1.53 ct Loose Orange Sapphire, 6.3 x 4.1 mm Oval Cut From Tanzania

5.66 ct Oval Tiger's Eye, 10.2 x 8 mm From Thailand

3.28 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 6.8 x 6.8 mm

10.31 ct Octagon Cut Rose Quartz, 13 x 13 mm From South Africa

46.53 ct Fancy Chrysocolla, 32.9 x 22 mm From Australia

14.06 ct Oval Maw-Sit-Sit, 14.9 x 13 mm From Myanmar

1.14 ct Oval Cut Peridot, 7.9 x 5.9 mm From China

9.59 ct Fancy Fire Agate, 19.3 x 9.5 mm From Mexico

36.57 ct Marquise Chrysocolla, 45.5 x 19.4 mm From Australia

2.44 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 9 x 6.5 mm

5.46 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.1 x 4.9 mm

1.18 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

0.55 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.1 x 3.2 mm

Gemstone Information

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