Calibrated 18 x 13 mm Oval Shape Natural Loose Gemstones: 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 oval shapes, facet cut and cabochon gems available now in 18 x13 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

Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

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Overall Rating -> 9

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

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Overall Rating -> 10

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

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Overall Rating -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

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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 -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

Posted By Bikerwalrus in October, 2023

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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 love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

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

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Overall Rating -> 10

Love Gem select. great gems for the price. Can't beet them

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Overall Rating -> 10

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

5.65 ct Carved Prehnite, 15.6 x 11.3 mm From South Africa

2.22 ct Oval Strawberry Quartz, 9.1 x 7.2 mm From Russia

1.78 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 25.2 x 3.4 mm

5.07 carat Blue Zircon, Oval loose Zircon from Cambodia, Natural Gem, 9.2 x 7.8 mm

2.1 carat Yellow Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 7.1 mm

3.11 carat Red Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 5.1 mm

1.13 ct Loose Violet Sapphire, 7.2 x 4.9 mm Cushion Cut From Tanzania

1.04 carat Round Cabochon Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.2 mm

0.24 ct Brown Diamond, 3.3 mm Diamond Cut From India

34.23 ct Cushion Jasper, 29.6 x 21 mm From Indonesia

1.23 ct Pink Morganite, 7.2 mm Round Cut From Afghanistan

2.1 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 5.8 mm

16.22 ct Trillion Jasper, 17.5 x 16.3 mm From Indonesia

15.15 ct Round Rainbow Moonstone, 16.8 mm From the United States

1.43 ct Baguette Cut Smoky Quartz, 9.1 x 6 mm From Brazil

2.82 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.9 mm

12.19 ct Baguette Tiger's Eye, 17.9 x 13.1 mm From Thailand

9.78 ct Pink Kunzite, 15 x 8.1 mm Octagon Cut From Afghanistan

3.41 ct Yellow Sphene, 10.4 x 8.2 mm Oval Cut From Sri Lanka

23.18 ct Square Rainbow Moonstone, 16.5 x 16.2 mm From the United States

3.95 ct Black Star Sapphire, 9.8 x 7.7 mm Oval Cut From Thailand

6 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.1 x 8.1 mm

0.53 ct Loose Orange Sapphire, 3.9 mm Round Cut From Tanzania

1.02 ct Loose Yellow Sapphire, 7 x 5.1 mm Oval Cut From Madagascar

0.46 ct Loose Violet Sapphire, 6.1 x 4.1 mm Oval Cut From Tanzania

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

4.21 ct Fancy Fire Agate, 13.4 x 7.6 mm From Mexico

1.14 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 9.1 x 4.4 mm

2.43 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 10.5 x 7.9 mm

40.04 ct Loose Oval Tiger's Eye Matrix, 35.1 x 20.7 mm From Mexico

0.55 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 4.9 mm

29.15 ct Pink Coral, 25 x 16.7 mm Carved From Taiwan

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