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 -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

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Overall Rating -> 10

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Overall Rating -> 10

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

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Overall Rating -> 10

Found what I was looking for

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Overall Rating -> 9

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

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Overall Rating -> 10

I have used this site for sseveral years now. All has been great. I started collection gems from GemSelect for years and wanted to collect at least one of most stones. I loved Safers because the mols is a 9 + and they come in every color. This is the best place to buy gems for the assortment and price. Great place to learn about gems too. Sometimes the shipping is a little on the long side. But I would give them a 9.9 out of 10 !!

Posted By Steve in July, 2023

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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

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Overall Rating -> 10

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

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

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Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

Posted By T-bone in October, 2023

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Overall Rating -> 9

making my own jewelry for my birth stone

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Overall Rating -> 10

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

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Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

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Gemstones A-Z

Buy Oval Shape 12x10 mm Gems

6.21 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gem, 14.9 x 10.9 mm

32.82 ct White Scolecite, 33.8 x 22 mm Cushion Cut From South Africa

13.71 ct Oval Rose Cut Lapis Lazuli, 27.1 x 12.4 mm From Afghanistan

40.5 ct Drilled Sphere Rhodochrosite, 16.1 mm From South Africa

35.03 ct Oval Jasper, 31.4 x 20.3 mm From Indonesia

1.13 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 6.1 x 4.1 mm

112.1 ct Round Dendritic Agate, 51.3 mm From India

9.75 carat Pear Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 23.6 x 12 mm

37.04 ct Green Quartz, 22.6 x 18.5 mm Oval Cut From Brazil

0.6 ct Violet Spinel, 5.1 mm Round Cut From Tanzania

2.24 ct Orange Sunstone, 8.8 mm Round Cut From India

28.27 ct Oval Obsidian, 29.2 x 21.8 mm From India

18.07 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 16.3 x 13.5 mm

85.07 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 32.6 x 24.9 mm

15.08 carat Swiss Blue Topaz, Carved Fruit loose Topaz from Brazil, Natural Gem, 23.4 x 13 mm

3.92 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Tanzania, Natural Untreated Gems, 7.1 x 5.1 mm

0.9 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 7 x 5 mm

11.79 ct White Jadeite, 20.1 x 15.8 mm Oval Cut From Myanmar

0.7 ct Loose Yellow Sapphire, 4.2 x 4.2 mm Square Cut From Tanzania

0.73 ct Oval Cut Peridot, 7 x 4.8 mm From China

0.75 ct Loose Pink Sapphire, 7.3 x 5 mm Odd Shaped From Madagascar

2.29 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

0.56 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.5 x 4.6 mm

8.45 carat Pink Morganite, Pear loose Morganite from Afghanistan, Natural Untreated Gem, 17 x 11.1 mm

6.32 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12.2 mm

2.82 ct Loose Trillion Cut Amethyst, 10.1 x 9.8 mm From Brazil

4.04 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.3 x 8.2 mm

1.9 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 5.6 x 3.7 mm

3.37 ct Blue Green Grandidierite, 11.6 x 8.8 mm Oval Cut From Madagascar

49.2 ct Oval Jasper, 34.7 x 22.1 mm From Indonesia

0.46 ct Loose Orange Sapphire, 4.8 x 4.7 mm Heart Cut From Tanzania

4.75 ct Round Prehnite, 7.6 mm From South Africa

Gemstone Information

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