Calibrated Trillion Cut Gemstones in Size 15x15 mm

Some people by gems by color or prize, 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 15 mm x 15 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 15x15 mm Gems

5.71 carat Carved Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.7 x 12.2 mm

7.13 ct Round Cut Strawberry Quartz, 12.1 mm From Russia

1.31 ct Blue Kyanite, 6.2 mm Round Cut From Nepal

1.57 ct Oval Strawberry Quartz, 8.1 x 6.2 mm From Russia

8.14 ct Oval Actinolite Cat's Eye, 15.5 x 11.9 mm From the United States

9.4 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 14 x 10.1 mm

2.42 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gems, 6 mm

32.02 ct Oval Hematite, 23.3 x 16.2 mm From Brazil

4.49 ct Oval Strawberry Quartz, 11 x 9.1 mm From Russia

1.52 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 4.9 x 2.9 mm

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

1.11 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.8 x 5.8 mm

1.31 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.4 x 3.7 mm

1.35 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.3 x 3.4 mm

16.35 ct Green Agate, 12.4 x 11.6 mm Oval Cut From India

11 ct Gray Jadeite, 19.9 x 11.7 mm Oval Cut From Myanmar

1.91 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 x 7.2 mm

0.55 ct Loose Orange Sapphire, 5 x 3.9 mm Octagon Cut From Tanzania

10.55 carat Bi-color Ametrine, Briolette with Hole loose Ametrine from Brazil, Natural Untreated Gem, 18.5 mm

4.31 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 4 mm

8.31 ct Oval Cut Strawberry Quartz, 12 x 9.9 mm From Russia

2.81 ct Loose Cushion Mystic Quartz, 7.1 x 7.1 mm From Brazil

0.64 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 10 x 3.6 mm

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

4.75 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 16 x 8 mm

9.65 ct Round Cut Color-Change Fluorite, 14 mm From Brazil

1.41 ct Oval Sillimanite Cat's Eye, 7.3 x 5.5 mm From Madagascar

1.43 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12 x 6 mm

1.37 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.5 x 4.8 mm

1.64 ct Loose Purple Sapphire, 6 x 3.1 mm Marquise Cut From Tanzania

6.72 ct Odd Shaped Hemimorphite Druzy, 12.1 x 12.1 mm From Congo

9.75 ct Blue Green Grandidierite, 14.6 x 10.7 mm Oval Cut From Madagascar

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