Calibrated Square Cut Gemstones in Size 13x13 mm

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 Square shapes, facet cut and cabochon gems available now in 13 mm x 13 mm 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 meant nor 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

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

Source: Bizrate

Overall Rating -> 10

Great website and information

Posted By Moonshot in December, 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 -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

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Overall Rating -> 9

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023

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Overall Rating -> 10

Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

Posted By Ray in January, 2024

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Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

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Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 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

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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

Excellent selection of products. Website easy to navigate and make purchases.

Posted By David in April, 2023

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

Source: Bizrate

Overall Rating -> 10

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

Posted By ChiChi in January, 2024

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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 -> 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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Gemstones A-Z

Buy Square Shape 13x13 mm Gems

0.16 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 mm

1.12 ct Oval Cut Chrysoberyl, 6.8 x 5.6 mm From Sri Lanka

0.9 ct Oval Strawberry Quartz, 7.3 x 6 mm From Russia

64.04 ct Oval Jasper, 40.9 x 27.2 mm From Indonesia

0.74 ct Loose Orange Sapphire, 6 x 5 mm Oval Cut From Tanzania

2.08 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9 x 9 mm

14.22 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 17.2 x 13 mm

1.47 ct Oval Cat's Eye Scapolite, 7.3 x 6 mm From Madagascar

4.89 carat Trillion Rhodolite Garnet, loose Certified Rhodolite Garnet from Tanzania, Natural Untreated Gems, 5.1 x 5 mm

6.2 ct Round Larimar, 11.9 mm From the Dominican Republic

8.17 ct Loose Oval Agate, 13.6 x 12 mm From Indonesia

4.47 ct Yellow Agate, 11.7 x 10.2 mm Oval Cut From India

3.14 carat Pear Prehnite, loose Certified Prehnite from South Africa, Natural Untreated Gem, 8.4 x 7.8 mm

1.26 ct Yellow Beryl, 8 x 7.5 mm Trillion Cut From Madagascar

1.67 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.3 x 4.3 mm

5.88 ct Oval Cut Prehnite, 13.9 x 9.9 mm From South Africa

0.95 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.3 x 5.3 mm

6.72 ct Octagon Cut Smoky Quartz, 11.2 x 11.2 mm From Brazil

0.78 carat Pear Shape Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gem, 6.9 x 4.7 mm

2.53 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

0.17 carat Round Emerald, loose Certified from Colombia, Natural Gem, 3.5 mm

3.89 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.5 x 7.1 mm

2.18 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gem, 10.9 x 8.9 mm

0.76 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 11.6 x 3.6 mm

4.98 ct Round Labradorite, 8.2 mm From Madagascar

19.1 ct Green Amazonite, 20 x 10.3 mm Marquise Cut From Madagascar

0.15 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

2.12 ct Oval Cut Andalusite, 6.1 x 4.1 mm From Brazil

15.27 ct Black Spinel, 12 mm Round Rose Cut From Thailand

1.9 ct Oval Sillimanite Cat's Eye, 7.5 x 5 mm From Madagascar

1.39 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.4 x 6 mm

0.71 carat London Blue Topaz, Square loose Topaz from Brazil, Natural Gem, 4.8 x 4.7 mm

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