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

I have been buy from you for years

Posted By JohnA in May, 2023

Source: Bizrate

Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

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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

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Overall Rating -> 10

No issues at all. It was great.

Posted By LJXK in May, 2023

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Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

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Overall Rating -> 8

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 The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

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Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

Posted By T-bone in October, 2023

Source: Bizrate

Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

Source: Bizrate

Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

Source: Bizrate

Overall Rating -> 10

I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

Source: Bizrate

Overall Rating -> 10

The website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023

Source: Bizrate

Overall Rating -> 10

The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

Posted By Jrplunk in April, 2024

Source: Bizrate

Overall Rating -> 10

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

Posted By Devi in October, 2023

Source: Bizrate

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

0.59 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6 x 4.1 mm

1.97 ct Yellow Quartz, 7.3 x 7.1 mm Carved From Brazil

1.58 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.9 x 5 mm

0.85 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

1.43 ct Baguette Cut Smoky Quartz, 9.1 x 6 mm From Brazil

7.05 ct Round Cut Smoky Quartz, 12.8 mm From Brazil

1.41 carat Pear Shape Kornerupine, loose Certified Kornerupine from Sri Lanka, Natural Untreated Gem, 9.3 x 6.3 mm

1.58 ct Yellow Beryl, 9.2 x 7.2 mm Oval Cut From Brazil

2.05 carat Blue Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 8.6 x 6.4 mm

1.88 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18.6 x 3.9 mm

3.58 ct Loose Trillion Concave Cut Mystic Quartz, 8.1 x 8.1 mm From Brazil

1 ct Orange Sphalerite, 5.7 mm Round Cut From Spain

1.41 ct Purple Spinel, 6.7 x 5.4 mm Cushion Cut From Tanzania

17.07 ct Black Spinel, 13.2 x 12.6 mm Heart Rose Cut From Thailand

3.89 ct Green Jade, 12.2 x 10.3 mm Oval Cut From Myanmar

0.42 ct Orange Sphalerite, 4.4 mm Round Cut From Spain

0.15 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.5 mm

9.25 ct Purple Kunzite, 16.1 x 9.3 mm Oval Cut From Afghanistan

2.96 carat Pink Kunzite, Pear Shape loose Kunzite from Afghanistan, Natural Untreated Gem, 10.3 x 7.3 mm

2.94 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 7 x 6.9 mm

1.24 ct Loose Oval Cut Black Opal, 10.1 x 7.7 mm From Ethiopia

2.49 ct Round Cut Peridot, 4.5 mm From China

2.36 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.6 x 6.7 mm

0.44 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.6 x 4 mm

2.8 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 5.9 x 4 mm

1.14 ct Oval Peridot, 6.1 x 4.2 mm From China

14.98 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 15.8 x 13.1 mm

4.06 ct Trillion Black Opal, 13.7 x 13.1 mm From Ethiopia

50.87 ct Baguette Jasper, 28.1 x 21.8 mm From Indonesia

1.92 ct Loose Square Cut Sapphire, 2.6 x 2.6 mm From Tanzania

12.49 carat Sky Blue Topaz, Carved Leaf loose Topaz from Brazil, Natural Gem, 19.1 x 12.5 mm

3.32 ct Round Checkerboard Smoky Quartz, 7.9 mm From Brazil

Gemstone Information

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