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

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

Source: Bizrate

Overall Rating -> 10

Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

Posted By Dee in September, 2023

Source: Bizrate

Overall Rating -> 10

No issues at all. It was great.

Posted By LJXK in May, 2023

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Overall Rating -> 10

I loved the opportunity to shop on a website that I could trust 👍

Posted By Will J. Lover in September, 2023

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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 !

Posted By Jen in August, 2023

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Overall Rating -> 10

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

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Overall Rating -> 10

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 2023

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Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

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

Overall Rating -> 10

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 2023

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Overall Rating -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

Posted By JAB93 in June, 2023

Source: Bizrate

Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

Source: Bizrate

Overall Rating -> 10

Was easy to search for many gems and mineral stones.Authenticity of natural stones is important, and I feel this site offers some assurance on this.

Posted By DanM in November, 2023

Source: Bizrate

Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

Posted By Bikerwalrus in October, 2023

Source: Bizrate

Overall Rating -> 9

It was simple and clear to understand.

Posted By Thora007 in December, 2023

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Gemstones A-Z

Buy Round Shape 13 mm Gems

0.46 carat Green Sapphire, Oval loose Sapphire from Tanzania, Natural Gem, 5.1 x 4.2 mm

3.69 carat Black Tourmaline, Cushion loose Tourmaline from Mozambique, Natural Untreated Gem, 10.8 x 8.9 mm

1.41 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 10.3 x 4.9 mm

3.55 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.1 x 7.1 mm

3.25 carat Sky Blue Topaz, Princess-Cut loose Topaz from Brazil, Natural Gem, 8.2 x 8.1 mm

0.96 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4.1 mm

1.89 carat Heart Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8 x 7.9 mm

1.88 carat Gray Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 7.2 mm

14.94 ct Oval Agate, 16.5 x 13.6 mm From Indonesia

1.77 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 4 x 4 mm

0.53 ct Loose White Sapphire, 4.8 mm Round Cut From Tanzania

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

3.95 carat Yellow Apatite, Pear Shape loose Apatite from Madagascar, Natural Untreated Gem, 13.2 x 9 mm

30.78 carat Carved Flower Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 31 x 30.9 mm

1.84 ct Oval Cut Fire Opal, 10.6 x 7.9 mm From Mexico

5.1 ct Octagon Cut Smoky Quartz, 10.4 x 10.3 mm From Brazil

0.81 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 7.4 x 5.4 mm

1.35 ct Blue Green Grandidierite, 8.5 x 6 mm Oval Cut From Madagascar

28.49 ct Yellow Quartz, 20.7 x 15.7 mm Oval Cut From Brazil

3.47 ct Yellow Quartz, 11.1 x 11 mm Carved From Brazil

13.85 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 26 x 14.9 mm

6.77 ct Oval Actinolite Cat's Eye, 14.6 x 11.7 mm From the United States

1.22 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 14.8 x 3.2 mm

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

1.48 carat Orange Hessonite Garnet, Oval loose from Madagascar, Natural Untreated Gem, 7.4 x 6.1 mm

0.74 ct Oval Black Opal, 8 x 6.1 mm From Ethiopia

0.9 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4.1 mm

2.12 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.9 x 3.8 mm

23.11 ct Yellow Star Sapphire, 18.8 x 15.9 mm Oval Cut From Madagascar

5.98 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12 mm

3.69 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gems, 6.7 x 4.9 mm

8.44 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 12.1 x 8 mm

Gemstone Information

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