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

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The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

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Love gemselect

Posted By Joshua Howard in March, 2024

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Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

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Overall Rating -> 10

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Posted By RJ in April, 2024

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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 !

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

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Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

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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

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 had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

Posted By Phoenix in February, 2024

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Gemstones A-Z

Buy Round Shape 13 mm Gems

4.72 ct Green Jade, 12.4 x 10.1 mm Oval Cut From Myanmar

1.16 ct Purple Spinel, 6.2 x 6.2 mm Cushion Cut From Tanzania

0.56 ct Loose Purple Sapphire, 7.4 x 5.2 mm Odd Shaped From Tanzania

10.94 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gems, 20.7 x 9.9 mm

5.07 ct Loose Oval Star Ruby, 9.5 x 8.4 mm From Madagascar

0.85 ct Oval Sillimanite Cat's Eye, 6.4 x 4.6 mm From Madagascar

2.2 ct Oval Onyx, 7.9 x 5.9 mm From Sri Lanka

18.56 ct Gray Jadeite, 18.4 x 16.4 mm Oval Cut From Myanmar

8.27 carat Bi-color Ametrine, Emerald-Cut loose Ametrine from Brazil, Natural Untreated Gem, 12.6 x 11.5 mm

0.23 ct Black Diamond, 3.5 mm Diamond Cut From India

1.3 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.3 x 3.6 mm

2.07 ct Cushion Cut Peridot, 7.6 x 7.4 mm From Myanmar

2.02 ct Loose Orange Moonstone, 9.1 x 7.2 mm Cushion Cut From India

10.55 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 21.7 x 12.4 mm

0.73 ct Loose White Sapphire, 4.3 mm Diamond Cut From Madagascar

2.13 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

0.71 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.5 x 4.5 mm

0.86 ct Loose Yellow Sapphire, 5.5 mm Round Cut From Tanzania

0.66 ct Loose Yellow Sapphire, 3.6 x 3.6 mm Princess Cut From Tanzania

14.24 carat Pear Pietersite, loose Certified Pietersite from China, Natural Untreated Gems, 21.2 x 11.4 mm

0.8 carat Brown Tourmaline, Briolette loose Tourmaline from Tanzania, Natural Untreated Gem, 7 mm

8.97 ct Oval Rutile Quartz, 19.5 x 9.5 mm From India

0.17 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 mm

0.83 ct Loose White Sapphire, 4.5 mm Diamond Cut From Madagascar

0.88 carat Green Sapphire, Oval loose Sapphire from Tanzania, Natural Gem, 6.1 x 5.1 mm

6.37 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.3 x 8 mm

4.32 carat Pink Malaya Garnet, Round loose Malaya Garnet from Tanzania, Natural Untreated Gems, 5.4 mm

9.17 ct Round Maw-Sit-Sit, 12.9 mm From Myanmar

20.56 ct Oval Peanut Wood, 25.2 x 18.4 mm From Australia

3.45 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 11.9 x 10 mm

14.86 carat Cameo Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 25.6 mm

1.76 ct Orange Sunstone, 9.3 x 7.1 mm Oval Cut From India

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