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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Gemstone Information

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Overall Rating -> 10

Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

Posted By Ray in January, 2024

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Overall Rating -> 7

I placed order#384714 based on the picture on your website and the stone came in much darker. I'm sure it's the same stone i ordered but your lighting made it seem a lighter blue. I was trying to match a stone for a customer and based on the picture it would have been close enough but the stone in person is a mile off.

Posted By Bobk in February, 2024

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Overall Rating -> 10

My first order. I am anxious to see if what I ordered is what I receive.

Posted By KRJ in July, 2023

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Overall Rating -> 10

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 2023

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Overall Rating -> 9

Overall good, shipping prices just seem a little on the high side.

Posted By Steve in August, 2023

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Overall Rating -> 10

Great selection of various gems, easy to navigate site

Posted By Josh in August, 2023

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Overall Rating -> 10

Excellent site.

Posted By Boru in December, 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!

Posted By Orchidisle in February, 2024

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Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

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Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

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Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 2023

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Overall Rating -> 10

It was easy to navigate and I hope that the gem is as nice as the picture

Posted By 1 in April, 2024

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Overall Rating -> 10

Always have good experience

Posted By Ginnie in September, 2023

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Overall Rating -> 10

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

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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!

Posted By JAB93 in June, 2023

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

2.84 ct Oval Strawberry Quartz, 9.1 x 7.1 mm From Russia

2.37 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.4 mm

1.92 carat Blue Sapphire, Princess-Cut loose Sapphire from Madagascar, Natural Gems, 2.5 x 2.4 mm

7.38 ct Green Agate, 13 x 11.9 mm Oval Cut From India

1.3 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 7 x 4.9 mm

1.22 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 7.8 x 6 mm

3.94 carat Oval Strawberry Quartz, loose Certified from India, Natural Untreated Gem, 11.7 x 9.7 mm

21.97 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 18.3 x 15.4 mm

3.48 ct Round Labradorite, 7.1 mm From Madagascar

3.43 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 8 x 6.2 mm

3.77 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9 mm

30.91 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 23.2 x 18 mm

5.16 ct Trillion Pietersite, 14.5 x 13.7 mm From Namibia

9.43 carat Blue Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 16.9 x 13.5 mm

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

4.91 ct Orange Sunstone, 10 x 8 mm Oval Cut From India

15.44 carat Carved Fish Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 22.1 x 14.5 mm

7.84 ct White Moonstone, 9.1 mm Round Cut From India

4.1 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10 x 8.1 mm

3.32 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8.3 mm

9.04 ct Loose Oval Lapis Lazuli, 14.1 x 10.2 mm From Afghanistan

2.25 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 9.1 mm

1.53 ct Oval Carnelian, 8 x 6.1 mm From India

10.68 carat Pear Rainbow Moonstone, loose Certified Rainbow Moonstone from the United States, Natural Untreated Gem, 22.2 x 12.4 mm

1.88 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.7 x 6 mm

1.08 ct Cushion Cut Color-Change Diaspore, 6.1 x 5.2 mm From Turkey

1.23 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7 x 5.2 mm

25.84 ct Oval Pietersite, 30 x 21.7 mm From Namibia

36.06 carat Pear Charoite, loose Certified Charoite from Russia, Natural Untreated Gem, 30.8 x 27 mm

19.96 ct Oval Jasper, 21.9 x 16.3 mm From Indonesia

0.51 ct Loose Yellow Sapphire, 3.3 x 3.2 mm Princess Cut From Tanzania

1.15 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.5 x 5.6 mm

Gemstone Information

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