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 -> 10

Interested in unusual stones and found many that I purchased or will purchase in the near future. I have been a customer of gem select for almost ten years and have always been pleased with buying experience and the delivered product

Posted By Fairhope Pete in December, 2023

Source: Bizrate

Overall Rating -> 10

Great selection and excellent website.

Posted By JBW in October, 2023

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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 -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

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Overall Rating -> 10

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

Source: Bizrate

Overall Rating -> 9

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

Posted By Kasper in June, 2023

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

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Overall Rating -> 10

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

Source: Bizrate

Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

Source: Bizrate

Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

Posted By T-bone in October, 2023

Source: Bizrate

Overall Rating -> 10

Found what I was looking for

Posted By Rian in June, 2023

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

Source: Bizrate

Overall Rating -> 10

My first order. I am anxious to see if what I ordered is what I receive.

Posted By KRJ in July, 2023

Source: Bizrate

Overall Rating -> 10

Great Job today! No issues!

Posted By Samlovesgems777 in August, 2023

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Gemstones A-Z

Buy Trillion Shape 15x15 mm Gems

0.57 carat Oval Color-Change Garnet, loose Certified Color-Change Garnet from Tanzania, Natural Untreated Gem, 5.9 x 4.1 mm

2.42 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7 x 5.1 mm

5.35 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 9.1 x 7.1 mm

4.52 ct Oval Rose Cut Smoky Quartz, 9.6 x 7.7 mm From Brazil

23.82 ct Oval Rhodochrosite, 20.9 x 12.8 mm From South Africa

0.12 carat Baguette Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 2.7 x 2.5 mm

13.44 ct Baguette Jasper, 16.7 x 14.7 mm From Mexico

4.91 ct Brown Moonstone, 11.2 x 11.1 mm Carved From India

0.29 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 4 mm

0.6 carat Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6 x 4 mm

10.6 ct Purple Kunzite, 15.5 x 9.6 mm Cushion Cut From Afghanistan

2.53 ct Oval Sillimanite Cat's Eye, 7.2 x 5.2 mm From Madagascar

0.93 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.2 x 5.2 mm

10.82 ct Loose Oval Agate, 14.7 x 11.5 mm From Indonesia

1.15 ct Yellow Beryl, 8 x 6 mm Oval Cut From Madagascar

17.48 ct Baguette Jasper, 20.2 x 11.6 mm From Mexico

0.88 ct Loose Orange Sapphire, 6.1 x 4.9 mm Oval Cut From Tanzania

2.27 carat Blue Sapphire, Pear Shape loose Sapphire from Sri Lanka, Natural Gem, 8.5 x 8.5 mm

2.01 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 23.1 x 3.3 mm

1.64 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.2 x 5.9 mm

8.65 ct Blue Green Grandidierite, 15 x 11.8 mm Oval Cut From Madagascar

2.19 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.8 x 7.7 mm

6.43 ct Yellow Quartz, 14.1 x 10.8 mm Oval Diamond Cut From Brazil

8.09 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 11 x 9 mm

13.03 carat Pear Chalcedony, loose Certified Chalcedony from Brazil, Natural Untreated Gem, 26 x 13.7 mm

5.23 ct Round Rutile Quartz, 11 mm From India

4.83 carat London Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 10.2 x 10.1 mm

2.66 ct Loose Princess Cut Sapphire, 2.7 x 2.6 mm From Tanzania

1.99 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 8 x 6 mm

3.78 carat Purple Kunzite, Pear Shape loose Kunzite from Afghanistan, Natural Untreated Gem, 9.8 x 8.4 mm

8.28 ct Green Amazonite, 19.5 x 9.9 mm Marquise Cut From Madagascar

14.51 ct Oval Pietersite, 13.4 x 9.9 mm From Namibia

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