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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The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

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Gemstones A-Z

Buy Cushion Cut 12x10 mm Gems

23.57 ct Heart Hematite, 20.4 x 19.1 mm From Brazil

114.96 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 39.9 x 27.3 mm

3.64 ct Black Star Sapphire, 9.1 x 8.4 mm Oval Cut From Thailand

7.86 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 14.6 mm

13.19 ct Oval Rhodochrosite, 12.3 x 10.2 mm From South Africa

27.67 ct Oval Jasper, 30.2 x 22 mm From Indonesia

3.01 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9.1 x 6.9 mm

0.65 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

2.5 ct Round Cut Strawberry Quartz, 7 mm From Russia

1.28 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.2 mm

7.09 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 10.1 x 8.1 mm

1 ct Yellow Beryl, 8 x 6.1 mm Oval Cut From Madagascar

0.92 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6.1 x 4.1 mm

21.54 ct Marquise Hematite, 24.2 x 10.6 mm From Brazil

1.29 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.4 x 5.9 mm

6.1 ct Cushion Tiger's Eye, 10.4 x 10.2 mm From Thailand

0.82 carat London Blue Topaz, Square loose Topaz from Brazil, Natural Gem, 5 x 4.9 mm

18.62 ct Carved Prehnite, 15.7 x 9.9 mm From South Africa

2.95 ct Yellow Beryl, 11.2 x 8.8 mm Oval Cut From Brazil

3.56 carat Green Fluorite, Oval loose Fluorite from India, Natural Untreated Gem, 10.8 x 7.8 mm

2.71 ct Loose Princess Cut Sapphire, 2.7 x 2.6 mm From Tanzania

3.06 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

0.91 ct Yellow Sphene, 6.4 x 5.3 mm Oval Cut From Sri Lanka

0.48 ct Loose Yellow Sapphire, 4.4 x 2.5 mm Baguette Cut From Tanzania

1.55 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 10 x 7.8 mm

2.61 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9.2 x 7.1 mm

41.05 ct Cushion Fossil Coral, 20 x 15.7 mm From Indonesia

97.93 ct Carved Smoky Quartz, 39.5 x 27.1 mm From Brazil

1.2 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.1 x 5.1 mm

0.61 carat Emerald Cut Color-Change Garnet, loose Certified Color-Change Garnet from Madagascar, Natural Untreated Gem, 7 x 3.5 mm

4.7 ct Cushion Onyx, 11 x 11 mm From Sri Lanka

0.71 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 6.9 x 4.9 mm

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