Calibrated 12 x 10 mm Cushion Shape Loose Natural Gemstones from G...

Some people by gems by color or price, but for many, it is best to buy gems by size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated cushion shapes, facet cut and cabochon gems available now in 12 mm 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 meant nor 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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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 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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Gemstones A-Z

Buy Cushion Cut 12x10 mm Gems

1.93 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 7.3 x 7 mm

31 ct Round Obsidian, 31.5 mm From India

1.11 ct Oval Peridot, 6.1 x 4.1 mm From China

3.11 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 9.9 x 7.8 mm

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

3.72 ct Loose Orange Moonstone, 14 x 7 mm Marquise Cut From India

9.3 ct Oval Cut Prehnite, 16 x 12.1 mm From South Africa

1.31 ct Loose Brown Tourmaline, 7.8 x 6 mm Oval Cabochon From Mozambique

3.22 carat Blue Sapphire, Princess-Cut loose Sapphire from Madagascar, Natural Gems, 2.9 x 2.9 mm

0.98 ct Octagon Cut Peridot, 7 x 5 mm From China

20.89 ct Rainbow Pyrite, 22.7 x 21.3 mm From Russia

3.27 ct Multicolor Mystic Quartz, 8 mm Round Concave Cut From Brazil

14.46 carat Pear Boulder Opal, loose Certified Boulder Opal from Australia, Natural Untreated Gem, 23.6 x 13 mm

1.38 carat Blue Tanzanite, Round loose Tanzanite from Tanzania, Natural Gem, 6.1 mm

0.39 ct Loose Orange Sapphire, 3.7 mm Round Cut From Tanzania

4.81 ct Octagon Cut Rose Quartz, 10.4 x 10.4 mm From South Africa

0.88 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

0.64 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.4 x 4.1 mm

0.55 ct Yellow Beryl, 6.8 x 4.8 mm Oval Cut From Madagascar

5.41 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.7 x 10 mm

0.69 ct Oval Cut Fire Opal, 8.1 x 6.1 mm From Mexico

0.85 ct Baguette Cut Smoky Quartz, 6.5 x 5.5 mm From Brazil

7.26 ct Yellow Apatite, 11.9 x 10.4 mm Cushion Cut From Madagascar

1.31 ct Blue Apatite, 4.9 x 3.9 mm Oval Cut From Madagascar

4.76 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.2 x 8.1 mm

2.42 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gem, 7.5 mm

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

4.48 ct Fancy Fire Agate, 12.3 x 9.6 mm From Mexico

0.28 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 4 mm

1.68 carat Marquise Cut Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 16.2 x 6.7 mm

13.68 ct Round Cut Smoky Quartz, 16.9 mm From Brazil

2.41 ct Fancy Fire Agate, 9.7 x 7.6 mm From Mexico

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