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

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 was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

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Overall Rating -> 10

Pleasant.

Posted By Mk in November, 2023

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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 The only "bad" thing that I have to say is that the interface of the site is outdated.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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Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 2023

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Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

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Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

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Overall Rating -> 10

It was easy to search and find what i wanted

Posted By Gunner in November, 2023

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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

My overall interaction with your website was pleasant, as always.

Posted By RJ in April, 2024

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Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

Source: Bizrate

Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

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Overall Rating -> 10

Easy to use website, made it very easy to buy. Will shop here again.

Posted By Bjorn in January, 2024

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Overall Rating -> 10

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023

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Overall Rating -> 10

Great website and information

Posted By Moonshot in December, 2023

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Gemstones A-Z

Buy Square Shape 13x13 mm Gems

0.83 ct Loose Pink Sapphire, 7.8 x 5.2 mm Odd Shaped From Madagascar

3.52 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 8.9 x 6.8 mm

1.16 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.6 x 3.2 mm

8.05 carat Black Tourmaline, Oval loose Tourmaline from Tanzania, Natural Untreated Gem, 13.2 x 11.3 mm

52.67 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 27.5 x 19.4 mm

1.29 ct Loose White Sapphire, 4.2 mm Diamond Cut From Madagascar

1.56 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 22.2 x 3.2 mm

1.79 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 6.3 mm

1.63 ct Pink Morganite, 7.6 mm Round Cut From Afghanistan

3.18 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

32.3 ct Oval Jasper, 27.4 x 15.9 mm From Indonesia

3.54 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.7 mm

10.9 carat Pear Maw-Sit-Sit, loose Certified Maw-Sit-Sit from Myanmar, Natural Untreated Gem, 15.6 x 13.3 mm

1.46 ct Pink Morganite, 6.9 mm Round Cut From Afghanistan

3.83 ct Round Checkerboard Smoky Quartz, 8.2 mm From Brazil

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

0.55 ct Pink Spinel, 4.9 x 4.5 mm Cushion Cut From Tanzania

1.93 ct Yellow Beryl, 8.1 mm Round Cut From Madagascar

3.81 ct Round Checkerboard Smoky Quartz, 8.1 mm From Brazil

1.88 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.5 x 7.1 mm

2.78 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.2 x 5.2 mm

1.22 ct Orange Sunstone, 8 x 6.2 mm Oval Cut From India

1.73 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.7 x 5.9 mm

0.97 ct Oval Cut Peridot, 7.5 x 5.7 mm From China

3.27 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

0.5 ct Oval Cut Kornerupine, 4.2 x 3.3 mm From Sri Lanka

6.83 carat Pink Mystic Topaz, Pear Shape loose Mystic Topaz from Brazil, Natural Gem, 14.1 x 10.2 mm

33.92 ct Cushion Jasper, 30.1 x 19.6 mm From Indonesia

15.19 ct Yellow Quartz, 17.5 x 16.5 mm Carved From Brazil

1.42 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6 x 5.9 mm

6.14 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12.1 mm

1.85 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 11.1 x 8.5 mm

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