Calibrated 13 x 13 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 13 mm x 13 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 13x13 mm Gems

1.36 ct Loose Yellow Sapphire, 6.2 x 5 mm Oval Cut From Tanzania

0.27 carat Pear Shape Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 4.8 x 3.2 mm

0.37 ct Loose Orange Sapphire, 5 x 2.7 mm Marquise Cut From Tanzania

0.73 carat Emerald Cut Color-Change Garnet, loose Certified Color-Change Garnet from Madagascar, Natural Untreated Gem, 7.1 x 3.5 mm

0.72 ct Loose Yellow Sapphire, 5.2 x 4 mm Octagon Cut From Tanzania

6.24 ct Loose Baguette Tiger's Eye, 12 x 10 mm From Thailand

100.7 ct Yellow Quartz, 34.9 x 21.5 mm Oval Checkerboard From Brazil

2.36 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.1 x 5.1 mm

35.8 ct Fancy Jasper, 34.1 x 26.3 mm From Indonesia

1.67 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

1.54 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5 mm

24.01 ct Oval Cat's Eye Opal, 24.5 x 17.5 mm From Brazil

0.91 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 5.1 x 4 mm

2.78 ct Round Onyx, 7.1 mm From Sri Lanka

0.4 ct Oval Chrysoberyl Cat's Eye, 4.2 x 4 mm From Sri Lanka

0.29 ct Round Chrysoberyl Cat's Eye, 3 mm From Sri Lanka

2.85 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.2 x 9.9 mm

7.7 ct Princess Cut Rose Quartz, 11.7 x 11.7 mm From South Africa

4.6 ct Green Agate, 17.6 x 9.9 mm Carved From India

1.64 ct Loose Oval Concave Cut Mystic Quartz, 9.1 x 7 mm From Brazil

6.64 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.1 x 11.9 mm

4.66 ct Loose Pink Kunzite, 11 x 7.8 mm Octagon Cut From Afghanistan

7.18 ct Black Star Sapphire, 11.7 x 9.2 mm Oval Cut From Thailand

3.14 carat Pear Prehnite, loose Certified Prehnite from South Africa, Natural Untreated Gem, 8.4 x 7.8 mm

0.85 carat Yellow Beryl, Pear Shape loose Beryl from Brazil, Natural Untreated Gem, 8 x 5.2 mm

1.66 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.2 x 4.1 mm

1.42 ct Purple Spinel, 6.7 x 6.3 mm Cushion Cut From Tanzania

1.54 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

0.63 ct Loose Violet Sapphire, 6.2 x 4.2 mm Oval Cut From Tanzania

0.55 ct Loose Orange Sapphire, 4.3 x 4.3 mm Cushion Cut From Tanzania

2.37 ct Orange Sunstone, 10.3 x 8.4 mm Oval Cut From India

25.6 ct Oval Jasper, 20.1 x 15.2 mm From Indonesia

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