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

Convenient selection, arrival on time

Posted By Alin 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 -> 9

Gemselect is a good website with a great selection of loose gems for sale. The prices are fairly decent, with the only negative being the cut quality of the gems. This is my go to retailer for gemstones and will continue to be, given that the packages arrive in a timely manner.

Posted By Lunchies in April, 2024

Source: Bizrate

Overall Rating -> 10

I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

Posted By Ana in September, 2023

Source: Bizrate

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 -> 10

Love Gem select. great gems for the price. Can't beet them

Posted By Apps in September, 2023

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

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

Posted By Devi in October, 2023

Source: Bizrate

Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

Source: Bizrate

Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

Source: Bizrate

Overall Rating -> 10

Great website and information

Posted By Moonshot in December, 2023

Source: Bizrate

Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

Source: Bizrate

Overall Rating -> 9

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

Posted By Steve in August, 2023

Source: Bizrate

Overall Rating -> 10

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

Posted By MAGSMX in August, 2023

Source: Bizrate

Overall Rating -> 10

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

Posted By Skip in November, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 12 mm Gems

23.93 ct Oval Obsidian, 32 x 20.8 mm From the United States

1.89 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10.4 x 8.2 mm

2.48 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.2 x 4.1 mm

0.67 ct Oval Cut Peridot, 6.6 x 4.8 mm From China

3.32 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8.3 mm

1.98 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 8 x 6.1 mm

1.03 ct Baguette Cut Kornerupine, 7.8 x 4.1 mm From Sri Lanka

16.42 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil

15.26 ct Loose Oval Lapis Lazuli, 17.6 x 14.4 mm From Afghanistan

6.64 ct Fancy Fire Agate, 13.7 x 9.6 mm From Mexico

2.05 ct Yellow Beryl, 8.1 x 6 mm Oval Cut From Madagascar

62.26 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 36.8 x 30.2 mm

6.28 ct Octagon Concave Cut Smoky Quartz, 12.1 x 12 mm From Brazil

24.13 ct Cushion Fossil Coral, 18.2 x 11.4 mm From Indonesia

1.3 ct Loose Cushion Cut Mystic Quartz, 7 x 6.9 mm From Brazil

1.33 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 7.7 x 5 mm

1.85 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gem, 7 mm

0.67 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 7.1 x 5.1 mm

1.42 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.1 x 6 mm

1.22 ct Yellow Beryl, 8 x 7.9 mm Trillion Cut From Madagascar

0.63 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.2 x 4.3 mm

3.64 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.3 x 3.3 mm

5.06 ct Loose Round Cut Sapphire, 2.6 mm From Tanzania

1.3 ct Loose Yellow Sapphire, 5.8 x 4.8 mm Oval Cut From Tanzania

3.69 carat Emerald Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.8 x 3.9 mm

5.18 carat Blue Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 10.4 x 9.8 mm

0.98 carat Violet Spinel, Pear Shape loose Spinel from Tanzania, Natural Untreated Gem, 8.4 x 5.1 mm

2.53 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

1.7 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

17.44 ct Green Agate, 13.1 x 11.9 mm Oval Cut From India

6.55 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 9.1 mm

7.73 carat Pear Checkerboard Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gem, 16.1 x 11.7 mm

Gemstone Information

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