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

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Overall Rating -> 10

The website design is a bit finicky for mobile, but Im sure its most likely just a mobile issue. Amazing selection of products, great prices.

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Overall Rating -> 10

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

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Overall Rating -> 10

Found what I was looking for

Posted By Rian in June, 2023

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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

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Overall Rating -> 9

over the experience was similar to other sites i have used. The only real note I have is the checkout experience was tedious and discriminatory, i wouldn't accept visa gift cards, which not only have guaranteed funds but help protect from misuse of personal information, but would not accept my visa b/c it is a prepaid card. I don't have bank account and I have been using the prepaid card for years without issue so this was disappointing to me. I feel safer using reputable gem sites rather than amazon or ebay (I have been sold fake gems with fake certs on both), but not being able to use my own valid legitimate funds and having to find a friend to buy for me b/c I use a non-bank card like 40% of the country is insulting.

Posted By Iggywiggly in January, 2024

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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

Great selection and excellent website.

Posted By JBW in October, 2023

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Overall Rating -> 10

It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

Posted By Nikki J in September, 2023

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Overall Rating -> 10

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

Posted By Lindsy in October, 2023

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Overall Rating -> 10

The website is easy to search, the variety of gems is excellent and the educational information is interesting and helpful! Love browsing and shopping the GemSelect website!

Posted By Happiness in January, 2024

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Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023

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Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

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Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

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Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

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Gemstones A-Z

Buy Round Shape 13 mm Gems

30.7 ct Oval Pietersite, 30.1 x 22 mm From Namibia

3.51 ct Orange Sunstone, 9.9 mm Round Cut From India

46.14 carat Pear Shape Rose Quartz, loose Certified Rose Quartz from South Africa, Natural Untreated Gem, 30.1 x 24 mm

1.99 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.1 x 9 mm

0.89 ct Oval Sillimanite Cat's Eye, 7.2 x 5.1 mm From Madagascar

2.37 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 6.1 mm

23.16 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 31 x 17.6 mm

2.47 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.8 x 7.4 mm

0.98 ct Violet Spinel, 10.3 x 4.7 mm Marquise Cut From Tanzania

23.98 ct Loose Violet Lepidolite, 39.3 x 8.5 mm Pencil Cut From the United States

2.15 ct Yellow Beryl, 9.7 x 7.9 mm Oval Cut From Madagascar

1.71 ct Yellow Sphene, 7 x 6.6 mm Oval Cut From Sri Lanka

5.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.6 x 10.4 mm

21.22 ct Black Spinel, 16 x 12.1 mm Oval Rose Cut From Thailand

13.46 ct Gray Star Sapphire, 13.7 x 11.6 mm Oval Cut From Myanmar

1.55 ct Loose White Sapphire, 4.4 mm Diamond Cut From Madagascar

12.85 ct Carved Prehnite, 16.5 x 11.4 mm From South Africa

3.21 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.5 x 9.1 mm

39.75 ct Green Jadeite, 26.1 x 19.5 mm Oval Cut From Myanmar

1.31 carat Orange Sunstone, Oval loose Sunstone from India, Natural Untreated Gem, 8.3 x 6.3 mm

3.81 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 6.8 mm

2.15 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 4.9 mm

4.74 ct Yellow Sillimanite, 9.1 x 7.1 mm Oval Cut From Sri Lanka

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

2.39 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9 x 7.3 mm

0.63 carat Emerald Cut Color-Change Garnet, loose Certified Color-Change Garnet from Madagascar, Natural Untreated Gem, 7 x 3.5 mm

5.97 carat Sky Blue Topaz, Emerald Cut loose Topaz from Cambodia, Natural Gems, 8.2 x 7.9 mm

0.79 ct Loose Yellow Sapphire, 5.1 mm Round Cut From Tanzania

1.76 ct Round Cut Strawberry Quartz, 8 mm From Russia

2.31 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

0.8 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gems, 5.1 x 5 mm

6.66 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 10 x 8.1 mm

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