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

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

Source: Bizrate

Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

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Overall Rating -> 10

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023

Source: Bizrate

Overall Rating -> 10

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

Source: Bizrate

Overall Rating -> 10

Pleasant.

Posted By Mk in November, 2023

Source: Bizrate

Overall Rating -> 7

I placed order#384714 based on the picture on your website and the stone came in much darker. I'm sure it's the same stone i ordered but your lighting made it seem a lighter blue. I was trying to match a stone for a customer and based on the picture it would have been close enough but the stone in person is a mile off.

Posted By Bobk in February, 2024

Source: Bizrate

Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

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Overall Rating -> 10

love yall

Posted By Rock hunter in August, 2023

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Overall Rating -> 10

The website design is a bit finicky for mobile, but Im sure its most likely just a mobile issue. Amazing selection of products, great prices.

Posted By Kuba in December, 2023

Source: Bizrate

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 -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

Source: Bizrate

Overall Rating -> 10

the searching format was easy to find what i needed. It helped to be able to sort Lowest price to Highest because i wasnt looking to spend too much but i did want an actual stone and not imitation.

Posted By PixelComposer in January, 2024

Source: Bizrate

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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Gemstones A-Z

Buy Trillion Shape 15x15 mm Gems

2.54 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.7 x 7.8 mm

5.14 ct Ball Agate, 8.7 mm From Indonesia

2.86 ct Loose Yellow Sapphire, 4.8 mm Round Cut From Tanzania

74.99 ct Fancy Quartz With Marcasite, 42.7 x 24.3 mm From Brazil

0.82 ct Brown Sphene, 5.6 x 5.2 mm Oval Cut From Sri Lanka

2.29 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.2 mm

1.23 ct Pink Morganite, 7.2 mm Round Cut From Afghanistan

7.49 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13 mm

3.03 ct Blue Star Sapphire, 7.3 x 5.4 mm Oval Cut From Thailand

0.8 ct Loose Yellow Sapphire, 5.5 x 5.4 mm Trillion Cut From Tanzania

4.73 carat London Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 10.6 x 10.4 mm

1.44 carat Pink Malaya Garnet, Marquise Cut loose Malaya Garnet from Tanzania, Natural Untreated Gem, 10 x 5 mm

23.37 ct Square Hematite, 16.5 x 16.3 mm From Brazil

2.22 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.2 x 7.2 mm

1.53 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 3.9 mm

4.45 carat Green Tourmaline, Carved Leaf loose Tourmaline from Mozambique, Natural Untreated Gem, 16.2 x 10.9 mm

215.8 ct Oval Dendritic Agate, 71.8 x 57.7 mm From India

10.92 ct Loose Pear Bloodstone, 18.8 x 13.2 mm From Madagascar

1.76 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gem, 7 mm

1.76 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.4 x 3.6 mm

1.59 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.8 x 6.4 mm

1.4 ct Loose Orange Moonstone, 7.9 x 7.6 mm Trillion Cut From India

14.11 carat Pear Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 20.4 x 15.1 mm

1.75 carat Diamond Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 3.1 mm

0.16 carat Square Emerald, loose Certified Emerald from Colombia, Natural Gem, 2.9 x 2.9 mm

23.6 ct Carved Ruby-Zoisite, 18 x 17 mm From Tanzania

0.99 ct Square Cut Color-Change Diaspore, 5.4 x 5.2 mm From Turkey

1.85 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gem, 6.8 mm

1.02 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 5.9 x 5.9 mm

1.19 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.2 x 7 mm

43.74 ct Oval Coral, 33.6 x 23.9 mm From Mexico

3.18 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 5 x 2.6 mm

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