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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The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

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Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

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

Posted By JamesMichael781 in September, 2023

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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

Very good, very fast, everything as described.

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Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 9

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy 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

Found what I was looking for

Posted By Rian in June, 2023

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

3.6 ct Green Agate, 15.6 x 8.8 mm Carved From India

1.09 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.1 x 4.1 mm

0.17 ct Oval Cut Kornerupine, 4.1 x 2.9 mm From Sri Lanka

12.25 ct Gray Jadeite, 17.7 x 14.1 mm Oval Cut From Myanmar

13.21 ct Loose Oval Lapis Lazuli, 16.6 x 12.6 mm From Afghanistan

0.55 ct Pink Spinel, 5 x 4.9 mm Cushion Cut From Tanzania

1.43 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 7.9 x 6.3 mm

1.23 carat Swiss Blue Topaz, Trillion-Cut loose Topaz from Brazil, Natural Gem, 6.9 x 6.7 mm

1.38 ct Blue Apatite, 4.9 x 3.9 mm Oval Cut From Madagascar

4.97 ct Oval Rutile Quartz, 13 x 9 mm From India

0.74 ct Pink Morganite, 6.7 x 5.1 mm Oval Cut From Afghanistan

1.93 ct Round Cut Andalusite, 3.9 mm From Brazil

1.22 ct Pink Morganite, 7.5 mm Round Cut From Afghanistan

1.32 ct Oval Sillimanite Cat's Eye, 7 x 5 mm From Madagascar

15.13 ct Oval Star Ruby, 13.4 x 12.8 mm From Madagascar

22.52 ct Fancy Fossil Coral, 18.7 x 11.3 mm From Indonesia

3.29 ct Asscher Cut Rose Quartz, 9.6 x 9.5 mm From South Africa

2.41 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

2.1 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 9 x 7 mm

0.32 ct Orange Sphalerite, 3.9 mm Round Cut From Spain

0.61 ct Purple Spinel, 5.1 mm Round Cut From Tanzania

0.62 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 7 x 5 mm

2.19 ct Round Onyx, 5.6 mm From Sri Lanka

0.61 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 4 mm

35.88 carat Oval Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 36.7 x 19 mm

3.89 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12 x 6 mm

14.16 ct Round Cut Color-Change Fluorite, 15.1 mm From Brazil

3.24 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gem, 8.1 x 6.2 mm

18.89 ct Oval Jasper, 20.1 x 15.1 mm From Indonesia

5.44 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 17.7 x 10 mm

2.03 ct Black Star Sapphire, 8.7 x 6.6 mm Oval Cut From Thailand

3.87 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.1 x 7.9 mm

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