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

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

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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.

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Easy to use.

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Overall Rating -> 9

I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.

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Overall Rating -> 10

Everything was fine.

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Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

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I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

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Overall Rating -> 9

An it was good.

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Overall Rating -> 10

Fantastic dealer for quality gemstones. Website is easy to navigate, selection is superb, delivery of purchases is prompt. Easy to select incorrect payment options, however.

Posted By David W in May, 2023

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Overall Rating -> 10

I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

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Overall Rating -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

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Overall Rating -> 10

Selection and purchasing online was very easy

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Gemstones A-Z

Buy Square Shape 13x13 mm Gems

38.65 ct Round Hematite, 21.7 mm From Brazil

4.23 ct Oval Tiger's Eye, 12.2 x 8.2 mm From Thailand

1.35 ct Oval Sillimanite Cat's Eye, 8.1 x 4.9 mm From Madagascar

1.7 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 2.9 mm

1.33 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6.9 x 5 mm

2.44 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10 x 7.9 mm

36.24 ct White Coral, 34.9 x 17 mm Carved From Taiwan

3.77 carat Yellow Citrine, Cushion Checkerboard loose Citrine from Brazil, Natural Untreated Gems, 9.2 x 7.1 mm

0.63 ct Loose Orange Sapphire, 4.4 x 4.4 mm Cushion Cut From Tanzania

0.47 ct Loose Orange Sapphire, 4.2 x 4.2 mm Cushion Cut From Tanzania

2.85 ct Yellow Apatite, 8.5 x 8.4 mm Asscher Cut From Madagascar

6.48 ct Oval Prehnite, 7.7 x 6.3 mm From South Africa

0.64 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.2 x 4 mm

1.82 carat Heart Cabochon Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.3 x 6 mm

0.82 ct Cushion Cut Color-Change Diaspore, 7.1 x 4.5 mm From Turkey

11.24 ct Odd Shaped Jasper, 23.3 x 12.9 mm From Indonesia

1.21 ct Loose Purple Sapphire, 6.6 x 5.3 mm Cushion Cut From Tanzania

5.67 ct Diamond Cut Smoky Quartz, 12.1 mm From Brazil

1.97 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.2 mm

1.96 ct Blue Kyanite, 7.1 x 5.1 mm Oval Cut From Nepal

2.24 ct Round Cut Andalusite, 4.1 mm From Brazil

2.5 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 6.1 mm

4.57 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.8 x 7.7 mm

15.23 ct Cushion Jasper, 23.8 x 14.1 mm From Indonesia

0.98 ct Octagon Cut Peridot, 7 x 5 mm From China

4.3 ct Loose Marquise Pietersite, 19.4 x 7 mm From Namibia

76.78 ct Oval Variscite, 52 x 30.3 mm From Australia

0.31 ct Baguette Cut Iolite, 5.1 x 3.1 mm From Madagascar

0.56 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.2 x 4.1 mm

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

5.84 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 15.1 mm

3.03 ct Loose Orange Sapphire, 10 x 7.5 mm Oval Cut From Thailand

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