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

16.8 ct Pink Coral, 15.3 x 11.1 mm Carved From Taiwan

0.54 carat Blue Kyanite, Round loose Kyanite from Nepal, Natural Untreated Gem, 4.3 mm

0.33 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 4.7 x 3.3 mm

4.39 ct Oval Spectrolite, 10.1 x 8.2 mm From Finland

1.89 carat Orange Hessonite Garnet, Baguette Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 x 5.9 mm

0.18 ct White Diamond, 2.8 mm Diamond Cut From Brazil

1.23 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 7 mm

2.05 ct Orange Coral, 11.4 x 5.4 mm Oval Cut From Australia

10.96 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 26.1 x 7.8 mm

13.54 carat Blue Aquamarine, Emerald Cut loose Aquamarine from Madagascar, Natural Untreated Gem, 19.3 x 9.7 mm

0.86 carat Brown Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.8 x 5 mm

23.32 ct Cushion Chalcedony, 23.3 x 20.6 mm From Brazil

2.82 ct Yellow Cat's Eye Apatite, 9.5 x 7.1 mm Oval Cut From Kenya

3.96 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12.1 x 6 mm

6.63 ct Fancy Fire Agate, 16.6 x 11.6 mm From Mexico

1.26 ct Loose Round Cut Smoky Quartz, 7 mm From Brazil

13.7 ct Carved Prehnite, 22.4 x 13.8 mm From South Africa

0.95 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 6.9 x 6.9 mm

2.89 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.9 x 5.1 mm

1.47 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 4.9 mm

0.83 carat Pear Shape Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 9.8 x 6.6 mm

12.19 ct Loose Pink Kunzite, 13 x 11.8 mm Octagon Cut From Afghanistan

19.81 ct Oval Rainbow Moonstone, 21.9 x 15.4 mm From the United States

37.17 ct Fancy Malachite, 21.3 x 15.5 mm From Congo

2.29 carat Trillion Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gems, 7 x 7 mm

2.35 carat Purple Tourmaline, Pear Shape loose Tourmaline from Mozambique, Natural Untreated Gem, 11 x 6.5 mm

18.39 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 18.6 x 14.7 mm

3.08 ct Oval Tiger's Eye, 10.2 x 8.1 mm From Thailand

3.33 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

1.32 ct Pink Morganite, 7.2 mm Round Cut From Afghanistan

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

16.12 ct Violet Jadeite, 17.5 x 13.5 mm Oval Cut From Myanmar

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