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 -> 10

Everything was fine.

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Overall Rating -> 10

Gem Select has gems at afffordable prices.

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Overall Rating -> 10

Awesome

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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

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023

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Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 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 -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 2023

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Overall Rating -> 10

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

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Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

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Overall Rating -> 9

Good interaction with site

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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

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 -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

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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

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Gemstones A-Z

Buy Square Shape 13x13 mm Gems

2.52 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.9 x 7.8 mm

28.42 ct Baguette Hematite, 22.5 x 15.7 mm From Brazil

1.69 carat Orange Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 8 x 5.9 mm

1.45 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7 x 5.1 mm

2.82 ct Oval Cut Golden Beryl, 11.3 x 8.8 mm From Madagascar

9.11 ct Fancy Fire Agate, 18.5 x 11.1 mm From Mexico

2.06 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7 x 5 mm

1.68 ct Oval Cut Andalusite, 5.1 x 3.1 mm From Brazil

17.36 ct Yellow Quartz, 25.7 mm Briolette From Brazil

1.22 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8 x 6.2 mm

4.91 ct Orange Sunstone, 10 x 8 mm Oval Cut From India

10.48 ct Octagon Cut Smoky Quartz, 13.3 x 13.2 mm From Brazil

6.39 carat Pink Topaz, Oval loose Topaz from Brazil, Natural Gems, 10.2 x 8.1 mm

2.22 ct Cushion Cut Peridot, 8.6 x 7.7 mm From Myanmar

1.79 carat Orange Zircon, Emerald Cut loose Zircon from Tanzania, Natural Untreated Gem, 7.2 x 5.2 mm

2.19 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7.2 x 6.8 mm

2.93 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.9 mm

5.85 ct Round Cut Smoky Quartz, 12.3 mm From Brazil

2.63 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 10.6 x 8.1 mm

2.82 ct Green Agate, 17.6 x 8.6 mm Carved From India

8.59 ct Green Quartz, 12.8 x 12.5 mm Cushion Cut From Brazil

1.69 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.2 x 7.1 mm

1.53 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.1 x 6 mm

4.6 ct Green Agate, 17.6 x 9.9 mm Carved From India

32.01 ct Oval Serpentine, 28.5 x 17.4 mm From the United States

1.31 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8 x 6.2 mm

1.69 ct Purple Spinel, 6.9 x 6.4 mm Cushion Cut From Tanzania

1.45 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.2 x 3.4 mm

3.09 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9 x 8.9 mm

42.82 ct Oval Checkerboard Labradorite, 35 x 20.8 mm From Madagascar

3.08 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.1 x 3.2 mm

1.4 ct Loose Oval Cut Black Opal, 9.9 x 7.6 mm From Ethiopia

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