Calibrated 20 x 15 mm Oval Shape Natural Loose Gemstones: GemSelect

Some people by gems by color or pricze, 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 oval shapes, facet cut and cabochon gems available now in 20 x 15 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 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 round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most 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 site

Posted By Lord of Bananas in November, 2023

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Overall Rating -> 10

I purchase all of my stones from GemSelect! They're the best I've found for both selection and value.

Posted By Terry in June, 2023

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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.

Posted By Bob in November, 2023

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Overall Rating -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

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Overall Rating -> 10

Everything was fine.

Posted By Matt 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

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

Always have good experience

Posted By Ginnie in September, 2023

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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.

Posted By Kuba 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

Source: Bizrate

Overall Rating -> 10

Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

Posted By C.J. in February, 2024

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

Posted By JamesMichael781 in September, 2023

Source: Bizrate

Overall Rating -> 10

I loved the opportunity to shop on a website that I could trust 👍

Posted By Will J. Lover in September, 2023

Source: Bizrate

Overall Rating -> 10

Great experience! First time buyer

Posted By Todi89 in February, 2024

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Gemstones A-Z

Buy Oval Shape 20x15 mm Gems

0.76 ct Loose White Sapphire, 4.5 mm Diamond Cut From Madagascar

3.31 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9 x 6.9 mm

2.89 ct Green Sphene, 8.8 x 7.2 mm Oval Cut From Sri Lanka

0.42 carat White Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 4.7 x 4.2 mm

3.06 ct Loose Orange Sapphire, 8.4 x 7.4 mm Oval Cut From Thailand

1.95 ct Loose Round Cabochon Sapphire, 3.6 mm From Tanzania

2.3 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.3 x 5.4 mm

3.99 ct Yellow Quartz, 9.4 x 9.2 mm Carved From Brazil

4.24 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.9 x 6.8 mm

17.71 ct Green Amazonite, 19.8 x 10.1 mm Marquise Cut From Madagascar

28.87 ct Oval Rose Cut Onyx, 27.2 x 20.3 mm From Sri Lanka

0.64 ct Loose Pink Sapphire, 6 x 4.2 mm Oval Cut From Tanzania

1.15 ct Cushion Cut Color-Change Diaspore, 7.3 x 4.6 mm From Turkey

2.17 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 6.1 x 6.1 mm

0.83 ct Orange Sphalerite, 5.5 x 4.5 mm Oval Cut From Spain

1.08 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 8.9 x 4.6 mm

0.69 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.4 mm

2.2 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9 x 7 mm

0.59 ct Square Cut Color-Change Diaspore, 5 x 4.9 mm From Turkey

1.52 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.8 x 3.4 mm

2.5 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.9 x 7.4 mm

0.54 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.1 x 4.1 mm

1.13 ct Oval Carnelian, 8.1 x 6.1 mm From India

1.48 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gem, 10.3 x 7.6 mm

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

22.89 carat Blue Green Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 22.4 x 16.4 mm

7.81 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 17.3 x 9.2 mm

25.68 ct Carved Ruby-Zoisite, 20.7 x 20 mm From Tanzania

1 ct Loose Pink Tourmaline, 6.2 mm Round Cabochon From Mozambique

1.18 ct Baguette Cut Color-Change Diaspore, 10.7 x 3.7 mm From Turkey

24.27 carat Carved Flower Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 33.2 x 33.1 mm

18.89 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 27.8 x 17.7 mm

Gemstone Information

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