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 -> 9

I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.

Posted By Sparkle in March, 2024

Source: Bizrate

Overall Rating -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

Source: Bizrate

Overall Rating -> 10

Selection and purchasing online was very easy

Posted By Aggy in January, 2024

Source: Bizrate

Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

Source: Bizrate

Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

Source: Bizrate

Overall Rating -> 10

Excellent site.

Posted By Boru in December, 2023

Source: Bizrate

Overall Rating -> 10

Very Good

Posted By Julian in July, 2023

Source: Bizrate

Overall Rating -> 7

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023

Source: Bizrate

Overall Rating -> 10

Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

Posted By C.J. in February, 2024

Source: Bizrate

Overall Rating -> 10

The website is easy to search, the variety of gems is excellent and the educational information is interesting and helpful! Love browsing and shopping the GemSelect website!

Posted By Happiness in January, 2024

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

Source: Bizrate

Overall Rating -> 10

Great selection of various gems, easy to navigate site

Posted By Josh in August, 2023

Source: Bizrate

Overall Rating -> 10

Easy and fast

Posted By Mark in February, 2024

Source: Bizrate

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.

Posted By Nikki J in September, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 12 mm Gems

17.34 ct Loose Pear Cut Amethyst, 21.4 x 16.2 mm From Brazil

3 ct Brown Moonstone, 10.4 x 10.2 mm Carved From India

0.68 ct Orange Sphalerite, 5 mm Round Cut From Spain

2.38 ct Green Agate, 17.5 x 8.7 mm Carved From India

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

0.74 ct Square Cut Color-Change Diaspore, 5 x 5 mm From Turkey

3.99 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8.2 mm

2.79 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 6 x 5.9 mm

118.69 ct Odd Shaped Druzy Citrine, 44.7 x 28.2 mm From Uruguay

18.55 ct Oval Serpentine, 26.6 x 17.9 mm From the United States

0.37 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 4.9 x 3.8 mm

1.62 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.2 x 5.3 mm

6.39 ct Yellow Quartz, 12 mm Round Concave Cut From Brazil

1.61 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.1 x 6.1 mm

13.5 ct Yellow Quartz, 15.2 x 14.9 mm Asscher Cut From Brazil

1.65 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 6.5 mm

1.91 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 7.1 mm

4.64 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.2 x 10 mm

5.36 ct Oval Cat's Eye Scapolite, 11.2 x 8.9 mm From Madagascar

4.09 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12 x 5.8 mm

1.03 carat Orange Sunstone, Oval loose Sunstone from India, Natural Untreated Gem, 7.9 x 6.2 mm

3.1 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6 x 4 mm

7.8 ct Pink Morganite, 14.8 x 10.9 mm Oval Cut From Afghanistan

1.13 ct Loose Oval Cut Black Opal, 9.2 x 7.2 mm From Ethiopia

3.56 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 3.8 x 3.6 mm

22.34 carat Pear Rhodonite, loose Certified Rhodonite from Australia, Natural Untreated Gem, 25.4 x 18 mm

29.23 ct Fancy Fossil Coral, 21.7 x 14.7 mm From Indonesia

1.96 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.8 x 3.9 mm

15.69 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 25.6 x 17.7 mm

1.26 carat Orange Zircon, Emerald Cut loose Zircon from Tanzania, Natural Untreated Gem, 7 x 4.7 mm

11.24 ct Oval Tiger's Eye, 18.3 x 13.5 mm From India

1.86 ct Loose White Sapphire, 4.2 mm Diamond Cut From Madagascar

Gemstone Information

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Gemstone EDUCATION

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