Calibrated 12 x 12 mm Trillion Shape Loose Natural Gemstones from ...

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 Trillion shapes, facet cut and cabochon gems available now in 12 mm x 12 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 Trillion Shape 12x12 mm Gems

0.21 ct Black Diamond, 3.5 mm Diamond Cut From India

1.48 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.9 x 5.1 mm

0.1 ct Black Diamond, 1.9 x 1.9 mm Princess Cut From India

2.59 ct Yellow Quartz, 6.6 x 6.5 mm Carved From Brazil

21.2 carat Pear Obsidian, loose Certified Obsidian from the United States, Natural Untreated Gem, 26.3 x 20.1 mm

2.22 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.2 x 5.2 mm

2.57 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gems, 6.9 x 5.1 mm

0.63 ct Loose Yellow Sapphire, 3.6 x 3.5 mm Princess Cut From Tanzania

4.95 ct Round Cut Smoky Quartz, 11.7 mm From Brazil

3.87 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4.1 mm

22.44 ct Cushion Lapis Lazuli, 20.1 x 15.2 mm From Afghanistan

28.54 ct Oval Tiger's Eye Matrix, 29.8 x 20.3 mm From Mexico

7.46 ct Oval Fire Agate, 13.3 x 10.4 mm From Mexico

5.66 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 17.1 x 9 mm

3.36 ct Orange Sunstone, 9.8 mm Round Cut From India

1.61 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 8 x 6 mm

11.87 ct Odd Shaped Druzy Azurite, 18 x 14.7 mm From the United States

1.84 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Sri Lanka, Natural Untreated Gems, 3.8 x 3.7 mm

15.66 ct Oval Checkerboard Labradorite, 18 x 13.3 mm From Madagascar

0.94 carat Square Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 4.7 x 4.6 mm

0.75 ct Marquise Cut Peridot, 8.1 x 4.2 mm From China

0.23 ct Square Cut Kornerupine, 3.5 x 3.5 mm From Sri Lanka

12.07 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 18.4 x 14.9 mm

0.65 carat Teal Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 4.6 x 4.6 mm

6.52 ct Round Rutile Quartz, 10 mm From India

1.11 carat Pear Shape Chrysoberyl, loose Certified Chrysoberyl from Sri Lanka, Natural Untreated Gem, 7.5 x 5.5 mm

11.06 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 27.5 x 10.2 mm

3.19 ct Loose Yellow Sapphire, 5.9 x 4.9 mm Oval Cut From Tanzania

8.39 carat Round Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 8 mm

1.49 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5.1 mm

4.55 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.1 x 10 mm

6.08 ct Oval Star Ruby, 10 x 8.6 mm From Madagascar

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