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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all good

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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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Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

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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.

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Selection ability was straightforward and easy.

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023

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Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

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Overall Rating -> 10

Great experience! First time buyer

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I enjoyed browsing though different varieties of rubies. I felt that the experience was simple and easy to navigate!

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Good interaction with site

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Gemstones A-Z

Buy Round Shape 13 mm Gems

6.12 carat Green Agate, Pear loose Agate from India, Natural Gem, 12.1 x 11.7 mm

0.13 carat Square Emerald, loose Certified Emerald from Colombia, Natural Gem, 2.7 x 2.7 mm

0.86 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 6.9 mm

0.93 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 7.1 x 5.1 mm

1.8 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 6.9 mm

2.78 ct Round Cut Golden Beryl, 10.1 mm From Brazil

4.53 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 14.5 mm

0.77 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 8.7 x 3.7 mm

0.5 ct Loose Violet Sapphire, 5.8 x 4.1 mm Oval Cut From Tanzania

20.14 ct Oval Rose Quartz, 18.5 x 15 mm From South Africa

13.29 carat Swiss Blue Topaz, Ball loose Topaz from Brazil, Natural Gems, 9 mm

14.86 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 21.3 x 15.8 mm

0.82 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 10.9 x 3.2 mm

13.37 carat Bi-color Ametrine, Oval loose Ametrine from Brazil, Natural Untreated Gem, 17 x 13.8 mm

1.47 carat Pink Malaya Garnet, Round loose Malaya Garnet from Tanzania, Natural Untreated Gem, 6.9 mm

1.76 ct Oval Spectrolite, 10.1 x 8.3 mm From Finland

3.05 ct Princess Cut Peridot, 5 x 5 mm From China

1.95 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gem, 8 x 6.1 mm

1 ct Blue Green Apatite, 7.3 x 5.4 mm Oval Cut From Madagascar

1.06 carat Pear Shape Emerald, loose Certified Emerald from Colombia, Natural Gem, 8.1 x 5.6 mm

7.02 ct Oval Star Moonstone, 12.2 x 10 mm From India

1.12 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.9 x 6.1 mm

4.38 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.9 mm

0.31 ct Oval Cut Kornerupine, 4.8 x 3.4 mm From Sri Lanka

3.71 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.8 mm

2.1 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 6.1 mm

9.61 carat Bi-color Tourmaline, Carved Flower loose Tourmaline from Mozambique, Natural Untreated Gems, 13.9 x 13.8 mm

8.81 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 13.9 x 8.2 mm

5.18 ct Blue Star Sapphire, 6.9 x 5.1 mm Oval Cut From Thailand

2.39 ct Oval Sillimanite Cat's Eye, 7.7 x 4.9 mm From Madagascar

2.8 ct White Moonstone, 9 mm Round Cut From India

3.47 ct Oval Prehnite, 10.4 x 7.6 mm From South Africa

Gemstone Information

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