Buy 12 mm Round Calibrated Gemstones from GemSelect

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 Round shapes, facet cut and cabochon gems available now in 12 mm diameter 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 usually 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

Great website and information

Posted By Moonshot in December, 2023

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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.

Posted By Spinach in May, 2023

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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.

Posted By ChiChi in January, 2024

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Overall Rating -> 10

The site is very easy to use and I will continue to shop here. The quality is superb

Posted By Genia in January, 2024

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

Posted By Jf in January, 2024

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Overall Rating -> 10

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023

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Overall Rating -> 10

Easy to navigate

Posted By G Funk in December, 2023

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Overall Rating -> 10

Great selection and excellent website.

Posted By JBW in October, 2023

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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

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Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

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Overall Rating -> 10

I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

Posted By Ray in December, 2023

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Overall Rating -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

Posted By JAB93 in June, 2023

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Overall Rating -> 10

all good

Posted By John in December, 2023

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Gemstones A-Z

Buy Round Shape 12 mm Gems

4.27 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10 x 7.8 mm

4.8 ct Loose Oval Cut Strawberry Quartz, 12.2 x 10 mm From India

25.84 ct Oval Pietersite, 30 x 21.7 mm From Namibia

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

2.47 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.8 x 7.4 mm

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

1.14 ct Loose Yellow Sapphire, 7.1 x 5.1 mm Oval Cut From Madagascar

0.86 ct Yellow Beryl, 7.1 x 7 mm Trillion Cut From Madagascar

1.02 ct Oval Sillimanite Cat's Eye, 7.4 x 5.1 mm From Madagascar

24.09 ct Oval Moss Agate, 25.8 x 13.6 mm From India

6.44 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gems, 14.9 x 7 mm

0.67 carat London Blue Topaz, Square loose Topaz from Brazil, Natural Gem, 5 x 4.9 mm

1.76 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.2 mm

3.84 carat Round Almandine Garnet, loose Certified Almandine Garnet from Madagascar, Natural Untreated Gems, 3.2 mm

1.63 ct Loose Yellow Sapphire, 8.2 x 6.2 mm Oval Cut From Madagascar

4.22 carat White Topaz, Square loose Topaz from Brazil, Natural Untreated Gems, 4 x 3.9 mm

23.96 ct Baguette Hematite, 19 x 14.7 mm From Brazil

2.76 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.9 mm

0.45 ct Orange Sphalerite, 4.6 mm Round Cut From Spain

0.94 carat Yellow Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 5.1 x 4 mm

8.45 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18 x 12.8 mm

0.54 ct Loose Orange Sapphire, 4.7 x 4.6 mm Heart Cut From Tanzania

0.39 carat Blue Sapphire, Trillion-Cut loose Sapphire from Madagascar, Natural Gem, 4.2 x 4 mm

5.18 ct Asscher Cut Rose Quartz, 10.7 x 10.6 mm From South Africa

0.98 ct Oval Chocolate Opal, 8 x 6 mm From Ethiopia

2.58 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.9 x 6.2 mm

4.62 ct Fancy Fire Agate, 13.3 x 9 mm From Mexico

1.2 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 5.9 mm

4.6 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

24.97 ct Cushion Fossil Coral, 18.2 x 11.5 mm From Indonesia

1.08 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7.1 x 5.2 mm

0.98 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6 x 4 mm

Gemstone Information

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