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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Gemstones A-Z

Buy Cushion Cut 12x10 mm Gems

1.56 ct Blue Kyanite, 5.2 mm Round Cut From Nepal

0.38 ct Loose Yellow Sapphire, 5 x 3.2 mm Octagon Cut From Tanzania

6.87 ct Trillion Pietersite, 15 x 14 mm From Namibia

19.45 ct Square Hematite, 17.5 x 17.1 mm From Brazil

3.44 ct Black Star Sapphire, 10.7 x 8.7 mm Oval Cut From Thailand

13.37 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gems, 15.1 x 11 mm

14.16 carat Sky Blue Topaz, Carved Fruit loose Topaz from Brazil, Natural Gem, 21.4 x 10.7 mm

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

1.73 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

33.88 ct Baguette Jasper, 24.4 x 16.9 mm From Mexico

15.42 ct Gray Jadeite, 19.3 x 12.6 mm Oval Cut From Myanmar

4.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10.1 mm

0.73 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.5 mm

4.19 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.9 x 7.9 mm

7.93 ct Loose Oval Agate, 12.5 x 11.2 mm From Indonesia

6.52 ct Rainbow Pyrite, 23.2 x 9 mm From Russia

6.99 ct Diamond Cut Smoky Quartz, 12.6 mm From Brazil

1.6 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.2 mm

1.96 ct Round Onyx, 5.5 mm From Sri Lanka

9.71 ct Oval Larimar, 16.2 x 12.1 mm From the Dominican Republic

45.48 ct Loose Pencil Cut Rainbow Moonstone, 38 x 12.7 mm From the United States

3.11 ct Pink Morganite, 9 mm Round Cut From Afghanistan

1.15 ct Pink Morganite, 8 x 5.9 mm Oval Cut From Afghanistan

6.68 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.8 x 11.7 mm

1.5 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 6.2 x 6 mm

1.55 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 8.8 x 5.9 mm

1.68 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

2.93 ct Round Cut Peridot, 4.9 mm From China

5.24 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8.4 mm

0.34 ct Loose Yellow Sapphire, 5 x 2.6 mm Marquise Cut From Tanzania

1.69 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.1 x 6.1 mm

1.53 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

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