Calibrated 12 x 12 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 12 mm x 12 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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The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

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Overall Rating -> 10

The website is easy to navigate and the images are incredible.

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

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Overall Rating -> 10

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

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Well presented images, clear information, quick and easy check out.

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Overall Rating -> 9

Overall good, shipping prices just seem a little on the high side.

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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

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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!

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Overall Rating -> 10

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

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Overall Rating -> 10

Very detailed and great pictures

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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

It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

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Overall Rating -> 10

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Overall Rating -> 9

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Overall Rating -> 10

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Gemstones A-Z

Buy Trillion Shape 12x12 mm Gems

4.23 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10 x 8.1 mm

0.66 carat Oval Grossularite Garnet, loose Certified Grossularite Garnet from Tanzania, Natural Untreated Gem, 5.6 x 4.4 mm

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

5.39 ct Odd Shaped Hemimorphite Druzy, 13.7 x 9.9 mm From Congo

5.01 ct Loose Pear Dendritic Agate, 13.8 x 9.9 mm From India

1.11 carat Orange Moonstone, Pear Shape loose Moonstone from India, Natural Untreated Gem, 9.1 x 6.1 mm

1.91 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 5.7 x 4 mm

2.34 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 8.1 x 6 mm

3.86 ct Oval Rutile Quartz, 12.1 x 8 mm From India

19.5 ct Oval Nuummite, 19.6 x 17.3 mm From India

16.02 ct Oval Rose Quartz, 18.3 x 13.1 mm From South Africa

0.62 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.1 mm

1.96 ct Cushion Cut Peridot, 8.8 x 6.6 mm From Myanmar

1.03 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 13.9 x 2.9 mm

1.96 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 8.1 mm

0.95 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 6.9 x 6.9 mm

5.63 ct Yellow Quartz, 13.9 x 7.8 mm Octagon Cut From Brazil

13.66 ct Loose Oval Lapis Lazuli, 18 x 13 mm From Afghanistan

3.14 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 7 mm

2.49 ct Orange Moonstone, 7.1 x 6.8 mm Cushion Cut From India

82.82 ct Odd Shaped Druzy Amethyst, 33.8 x 29.9 mm From Brazil

2.17 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 9.1 x 6 mm

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

29.05 ct Oval Maw-Sit-Sit, 18.2 x 15 mm From Myanmar

4.45 ct Oval Black Opal, 16.5 x 11.6 mm From Ethiopia

1.53 ct Blue Kyanite, 7.1 mm Round Cut From Nepal

37.19 ct Oval Bloodstone, 21.1 x 14.8 mm From Madagascar

43.16 ct Oval Rose Quartz, 23.7 x 19.2 mm From South Africa

14.01 ct Yellow Quartz, 20 x 15.2 mm Cushion Checkerboard From Brazil

1.65 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7 x 6.2 mm

5.01 carat Oval Strawberry Quartz, loose Certified from India, Natural Untreated Gem, 12.2 x 9.9 mm

0.77 ct Oval Cut Fire Opal, 8.1 x 6 mm From Mexico

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