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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Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023

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Overall Rating -> 10

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

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Overall Rating -> 10

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!

Posted By Orchidisle in February, 2024

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

Posted By APPS in April, 2024

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023

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Overall Rating -> 10

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023

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Overall Rating -> 10

Excellent selection of products. Website easy to navigate and make purchases.

Posted By David in April, 2023

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Overall Rating -> 10

Everything fine.

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Overall Rating -> 10

My last experience was good, in fact every experience I have had with them has met my expectations or surpassed them. These are really good people to work with.

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Overall Rating -> 10

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

Posted By Ray in February, 2024

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Overall Rating -> 9

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

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Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

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Overall Rating -> 10

The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

Source: Bizrate

Overall Rating -> 10

The website is very easy to use. The search function, filter and sort functions are very helpful.

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Gemstones A-Z

Buy Trillion Shape 15x15 mm Gems

7.36 carat Swiss Blue Topaz, Carved Flower loose Topaz from Brazil, Natural Gem, 13.3 x 10.2 mm

5.47 ct Fancy Fire Agate, 11.1 x 10 mm From Mexico

1.71 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

6.77 ct Pink Kunzite, 12 x 8.7 mm Octagon Cut From Afghanistan

1.08 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gems, 6.2 x 4.5 mm

6.28 ct Asscher Cut Smoky Quartz, 11.3 x 11.3 mm From Brazil

9.32 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 14.1 x 10 mm

7.59 ct Black Star Sapphire, 11.8 x 9.2 mm Oval Cut From Thailand

0.55 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.9 x 4 mm

8.73 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18 x 12.7 mm

12.42 ct Yellow Quartz, 16.1 x 15.7 mm Carved From Brazil

2.39 ct Oval Strawberry Quartz, 9.1 x 7.1 mm From Russia

17.84 ct Fancy Jasper, 34.6 x 14.7 mm From Indonesia

0.49 carat Pink Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.7 x 4.7 mm

1.25 ct Oval Checkerboard Rainbow Moonstone, 6.9 x 6.1 mm From India

5.96 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7.1 x 7 mm

3.24 ct Round Prehnite, 7.3 mm From South Africa

0.05 ct Black Diamond, 2.2 mm Diamond Cut From India

0.41 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.2 x 3.2 mm

0.75 ct Cushion Cut Color-Change Diaspore, 5.9 x 5 mm From Turkey

6.36 ct Oval Boulder Opal, 21.5 x 8 mm From Australia

11.46 ct Trillion Pietersite, 17 x 16.2 mm From Namibia

1.29 ct Loose Yellow Sapphire, 6 x 5 mm Oval Cut From Tanzania

0.89 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

8.83 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 11.1 x 9 mm

1.78 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

5.66 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15 x 9.1 mm

7.37 ct Octagon Cut Rose Quartz, 11.8 x 11.7 mm From South Africa

11.6 ct Fancy Fire Agate, 19.7 x 11.6 mm From Mexico

1.31 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 7.2 x 7.1 mm

0.9 carat Yellow Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 7.9 x 5.9 mm

2.95 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 8.1 x 6 mm

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