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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purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

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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.

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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.

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Everything was good but since I am still new I was surprised at how small the stones where.

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Gemstones A-Z

Buy Oval Shape 12x10 mm Gems

3.8 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 8 mm

1.87 ct Yellow Morganite, 8 x 5.9 mm Oval Cut From Afghanistan

12.72 ct Pink Azotic Topaz, 12.2 x 10 mm Cushion Cut From Brazil

1.19 ct Loose Cushion Cut Sapphire, 6 x 5.2 mm From Madagascar

4.17 ct Pink Morganite, 11.4 x 10.7 mm Trillion Cut From Afghanistan

2.67 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.8 x 4.8 mm

0.6 ct Loose Orange Sapphire, 4.3 x 4.3 mm Cushion Cut From Tanzania

1.66 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.2 x 6.8 mm

0.53 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

1.49 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gems, 6 x 5 mm

2.8 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.7 x 7.8 mm

1.78 carat Pear Shape Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7 x 5.1 mm

0.91 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 7.1 x 5 mm

25.94 ct Oval Rainbow Moonstone, 25.1 x 14.7 mm From the United States

7.82 ct Odd Shaped Hemimorphite Druzy, 14.6 x 10.6 mm From Congo

2.82 ct Red Andesine Labradorite, 10.3 x 8.2 mm Oval Cut From Congo

2.51 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5.4 x 3.5 mm

25.23 ct Oval Jasper, 30 x 22.1 mm From Indonesia

28.92 ct Oval Jasper, 32.9 x 21.5 mm From Indonesia

4.75 ct Orange Sunstone, 10.1 x 8.2 mm Oval Cut From India

2.22 ct Oval Cat's Eye Opal, 10.8 x 8.2 mm From Madagascar

4.67 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

2.84 ct Oval Cut Andalusite, 5 x 3.1 mm From Brazil

21.66 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 28.6 x 20.1 mm

8.35 ct Octagon Cut Smoky Quartz, 12 x 12 mm From Brazil

2.16 ct Round Cut Andalusite, 4.1 mm From Brazil

3.6 ct Loose Trillion Concave Cut Mystic Quartz, 8.1 x 8.1 mm From Brazil

0.77 ct Oval Cut Peridot, 6.9 x 4.9 mm From China

1.9 ct Blue Apatite, 5.2 x 4.2 mm Oval Cut From Madagascar

0.85 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6.1 x 4.2 mm

0.9 ct Oval Cut Peridot, 7.1 x 5 mm From China

11.05 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 13 x 11 mm

Gemstone Information

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