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

Awesome

Posted By Mic in May, 2023

Source: Bizrate

Overall Rating -> 10

I have used this site for sseveral years now. All has been great. I started collection gems from GemSelect for years and wanted to collect at least one of most stones. I loved Safers because the mols is a 9 + and they come in every color. This is the best place to buy gems for the assortment and price. Great place to learn about gems too. Sometimes the shipping is a little on the long side. But I would give them a 9.9 out of 10 !!

Posted By Steve in July, 2023

Source: Bizrate

Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 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

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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 -> 9

An it was good.

Posted By Miguel in June, 2023

Source: Bizrate

Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024

Source: Bizrate

Overall Rating -> 10

Super easy to do business for great products.

Posted By BoBBy in January, 2024

Source: Bizrate

Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

Source: Bizrate

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

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 -> 9

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

Posted By Kasper in June, 2023

Source: Bizrate

Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

Posted By Ray in December, 2023

Source: Bizrate

Overall Rating -> 10

Easy to use.

Posted By Hope in March, 2024

Source: Bizrate

Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 13 mm Gems

1.04 ct Yellow Sphalerite, 7 x 5 mm Oval Cut From Spain

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

23.14 ct Oval Serpentine, 32.3 x 20.8 mm From the United States

3.54 ct Round Cut Golden Beryl, 10.3 mm From Brazil

7.09 carat Bi-color Ametrine, Emerald-Cut loose Ametrine from Brazil, Natural Untreated Gem, 14 x 10 mm

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

0.54 ct Loose Yellow Sapphire, 4.2 x 4.2 mm Cushion Cut From Tanzania

0.8 ct Octagon Cut Color-Change Diaspore, 5.6 x 5 mm From Turkey

0.36 carat Yellow Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.6 x 3.1 mm

0.55 carat Pear Shape Mystic Quartz, loose Certified from Brazil, Natural Gem, 7 x 4.9 mm

4.99 ct Yellow Apatite, 11.8 x 10.6 mm Heart Cut From Madagascar

2.31 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.3 x 7.3 mm

2.16 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.1 x 9.6 mm

18.56 ct Oval Cat's Eye Opal, 19.6 x 17.3 mm From Brazil

22 ct Loose Blue Green Turquoise, 24.1 x 16.3 mm Oval Cut From the United States

8.12 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 13.9 x 8.1 mm

3.65 carat Pear Larimar, loose Certified Larimar from the Dominican Republic, Natural Untreated Gem, 13.1 x 9.2 mm

23.85 ct Cushion Chalcedony, 24.4 x 18.9 mm From Brazil

5.69 ct Round Cut Smoky Quartz, 11.9 mm From Brazil

1.62 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 11.5 x 7.8 mm

3.11 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.8 mm

3.58 ct Diamond Cut Andalusite, 3.6 mm From Brazil

37.39 ct Oval Jasper, 35.4 x 25.7 mm From Indonesia

10.98 ct Oval Star Ruby, 12.8 x 11.3 mm From Madagascar

1.54 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5 x 5 mm

1.05 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 9.2 x 4.4 mm

2.05 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

9.92 ct Fancy Boulder Opal, 17.4 x 15.5 mm From Australia

3.96 ct Square Labradorite, 7.1 x 7.1 mm From Madagascar

7.04 ct Black Spinel, 9.2 mm Round Rose Cut From Thailand

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

1.97 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 8.8 x 6.8 mm

Gemstone Information

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