Buy 13 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 13 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

My first purchase went well. I will purchase more gems in the future.

Posted By NoHalalAl in March, 2024

Source: Bizrate

Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

No issues at all. It was great.

Posted By LJXK in May, 2023

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Overall Rating -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023

Source: Bizrate

Overall Rating -> 10

Easy to use website, made it very easy to buy. Will shop here again.

Posted By Bjorn in January, 2024

Source: Bizrate

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!

Posted By Orchidisle in February, 2024

Source: Bizrate

Overall Rating -> 10

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

Source: Bizrate

Overall Rating -> 9

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

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

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

Posted By Ray in February, 2024

Source: Bizrate

Overall Rating -> 10

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023

Source: Bizrate

Overall Rating -> 9

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023

Source: Bizrate

Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 2023

Source: Bizrate

Overall Rating -> 10

Purchased for my granddaughter she was very pleased with it.

Posted By Charlie in April, 2024

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 13 mm Gems

3.6 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 8.7 x 7.2 mm

2.2 ct Orange Moonstone, 7.2 x 7.2 mm Square Cut From India

14.54 ct Cushion Checkerboard Nuummite, 16.3 x 14.3 mm From India

4.37 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12.1 x 6.1 mm

1.29 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8 x 6 mm

32.39 ct Oval Cat's Eye Opal, 22.3 x 20.3 mm From Brazil

1.73 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.8 x 6 mm

0.42 ct Loose Orange Sapphire, 4.9 x 3.9 mm Octagon Cut From Tanzania

6.42 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 12.2 x 10.2 mm

6.45 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 14.1 x 10.1 mm

53.89 ct Oval Larimar, 38 x 25.2 mm From the Dominican Republic

37.04 ct Green Quartz, 22.6 x 18.5 mm Oval Cut From Brazil

2.63 ct Green Agate, 9 x 7.6 mm Oval Cut From India

6.61 carat White Topaz, Emerald Cut loose Topaz from Brazil, Natural Untreated Gems, 10.1 x 7.9 mm

1.42 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.5 x 6.2 mm

0.67 ct Loose Purple Sapphire, 7 x 5.1 mm Oval Cut From Madagascar

0.86 ct Yellow Morganite, 7.8 x 5.6 mm Oval Cut From Afghanistan

15.93 carat Pear Fossil Coral, loose Certified Fossil Coral from Indonesia, Natural Untreated Gems, 20.2 x 11 mm

0.62 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.2 mm

2.81 ct Marquise Concave Cut Smoky Quartz, 17.9 x 7.1 mm From Brazil

5.09 ct Green Jade, 12.4 x 10.3 mm Oval Cut From Myanmar

4.08 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12 x 9.8 mm

17.94 carat Pear Obsidian, loose Certified Obsidian from the United States, Natural Untreated Gem, 27.7 x 19.1 mm

4.46 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 7.4 mm

7.83 ct Round Cut Smoky Quartz, 13.3 mm From Brazil

0.32 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.7 x 3.6 mm

2.47 ct Pink Morganite, 13.9 x 6.1 mm Marquise Cut From Afghanistan

22.13 ct Fancy Jasper, 36.7 x 14.7 mm From Indonesia

2.82 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.3 x 9.2 mm

2.45 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 8.9 x 7.1 mm

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

8.34 ct Round Cut Smoky Quartz, 14.7 mm From Brazil

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