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 -> 10

Everything was fine.

Posted By Matt in March, 2024

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Overall Rating -> 7

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

Posted By Steve in November, 2023

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Overall Rating -> 10

The website is very easy to use. The search function, filter and sort functions are very helpful.

Posted By Sboro in August, 2023

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Overall Rating -> 9

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.

Posted By Bob in November, 2023

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Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

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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

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

Posted By Fl_Beachcomber in October, 2023

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Overall Rating -> 10

Great selection of various gems, easy to navigate site

Posted By Josh in August, 2023

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Overall Rating -> 9

It was simple and clear to understand.

Posted By Thora007 in December, 2023

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Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 2023

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Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

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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

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Overall Rating -> 9

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

Posted By Steve in August, 2023

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Overall Rating -> 10

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

Posted By Apps in September, 2023

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Overall Rating -> 10

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

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Gemstones A-Z

Buy Round Shape 13 mm Gems

12.63 carat Bi-color Ametrine, Pear Concave Cut loose Ametrine from Brazil, Natural Untreated Gem, 21.1 x 12.7 mm

5.88 ct Odd Shaped Hemimorphite Druzy, 16.2 x 10.2 mm From Congo

9.95 ct Black Spinel, 10.2 mm Round Rose Cut From Thailand

4.57 carat Sky Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 8.1 mm

0.62 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.1 mm

2.43 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gems, 10.2 x 5.1 mm

1.39 carat Green Sapphire, Pear Cabochon loose Sapphire from Madagascar, Natural Gem, 6.3 x 5.2 mm

1.03 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10.2 x 7.1 mm

0.76 ct Loose Orange Sapphire, 6 x 4.1 mm Oval Cut From Tanzania

3 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 7.1 x 5.1 mm

3.55 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9.1 mm

2.85 ct Round Cut Peridot, 4.9 mm From China

3.88 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gems, 7.1 mm

0.26 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.9 mm

1.33 ct Loose Yellow Sapphire, 4.6 x 4.6 mm Cushion Cut From Tanzania

4.77 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.3 x 10 mm

32.3 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 33.4 x 19.8 mm

8.75 ct Square Lapis Lazuli, 11.1 x 11 mm From Afghanistan

13.54 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 13.9 x 10.1 mm

0.56 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 4.2 mm

0.67 ct Loose Yellow Sapphire, 4.5 x 4.5 mm Cushion Cut From Tanzania

1.52 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gem, 7.1 x 6.1 mm

4.99 ct Flower Cut Smoky Quartz, 11.5 x 11.2 mm From Brazil

0.45 ct Loose Yellow Sapphire, 5.2 x 3.3 mm Octagon Cut From Tanzania

35.88 ct Oval Star Ruby, 19.9 x 18.1 mm From Madagascar

1.33 carat Purple Kunzite, Pear Shape loose Kunzite from Afghanistan, Natural Untreated Gem, 7.1 x 5.6 mm

0.8 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8.2 x 4.2 mm

2.52 ct Loose Oval Malachite, 9 x 7.3 mm From Congo

1.23 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.2 x 3.4 mm

20.9 ct Fancy Jasper, 26.2 x 13.7 mm From Indonesia

11.91 carat Carved Rose Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.1 x 14.4 mm

2.28 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 22.2 x 3.6 mm

Gemstone Information

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