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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Overall Rating -> 10

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

Posted By Ray in February, 2024

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Overall Rating -> 10

My last experience was good, in fact every experience I have had with them has met my expectations or surpassed them. These are really good people to work with.

Posted By Spinach in May, 2023

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Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 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 The only "bad" thing that I have to say is that the interface of the site is outdated.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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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

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

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

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 -> 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

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

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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

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

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Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

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Overall Rating -> 10

Selection and purchasing online was very easy

Posted By Aggy in January, 2024

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Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

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Gemstones A-Z

Buy Round Shape 13 mm Gems

3.96 ct Yellow Imperial Topaz, 15 x 6.9 mm Cushion Cut From Brazil

0.51 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 4.8 mm

3.71 ct Asscher Cut Rose Quartz, 9.6 x 9.4 mm From South Africa

0.65 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

3.87 ct Yellow Quartz, 8.6 x 8.5 mm Carved From Brazil

60.06 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 31.4 x 21.8 mm

1.4 ct Blue Star Sapphire, 7.1 x 5.3 mm Oval Cut From Thailand

5.41 ct Loose Pear Dendritic Agate, 16.1 x 11.5 mm From India

2.62 ct Octagon Cut Peridot, 6.2 x 4.2 mm From China

3.41 ct Loose Pink Kunzite, 8.3 x 6.6 mm Octagon Cut From Afghanistan

1.14 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.9 x 3.6 mm

0.95 carat Orange Hessonite Garnet, Round loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 5.9 mm

0.38 carat Pear Shape Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.1 x 3.9 mm

30.5 carat Pear Boulder Opal, loose Certified Boulder Opal from Australia, Natural Untreated Gem, 29.4 x 21.8 mm

0.66 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 5.8 x 4.8 mm

16.74 ct Amethyst Geode Slice, 23.4 x 16 mm From Brazil

1.75 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 8.6 x 6.9 mm

1.37 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 21.1 x 2.8 mm

1.41 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 5 mm

20.16 ct Baguette Hematite, 15.8 x 12.1 mm From Brazil

0.62 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.2 x 4.2 mm

0.7 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 7.7 x 4 mm

0.53 ct Loose Orange Sapphire, 5.9 x 4.1 mm Oval Cut From Tanzania

8.2 carat Sky Blue Topaz, Carved Leaf loose Topaz from Brazil, Natural Gem, 18.4 x 10.5 mm

2.17 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 8.2 x 6.2 mm

0.97 carat Teal Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.3 x 5.2 mm

1.07 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gem, 7 x 5.1 mm

1.52 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.9 x 6.5 mm

2.42 ct Green Sphene, 8.3 x 7 mm Oval Cut From Sri Lanka

1.61 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8 x 6 mm

19.73 carat Bi-color Ametrine, Oval loose Ametrine from Brazil, Natural Untreated Gem, 19.3 x 14.8 mm

1.55 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5.1 mm

Gemstone Information

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