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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I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

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Overall Rating -> 10

Purchased for my granddaughter she was very pleased with it.

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all good

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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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Found the stone I wanted which was delivered quickly and met expectations.

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Easy to find the stones I was looking for. Always good quality stones

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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.

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Was easy to search for many gems and mineral stones.Authenticity of natural stones is important, and I feel this site offers some assurance on this.

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I feel pretty good so far, pending the delivery of the item ordered.

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Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

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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

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

1.23 carat Red Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.1 x 6.1 mm

11.28 ct Cushion Boulder Opal, 23.7 x 8.7 mm From Australia

1.83 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gem, 8 x 6.1 mm

0.84 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.1 x 6.6 mm

1.53 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.1 x 8.1 mm

10.65 ct Round Cut Color-Change Fluorite, 13.9 mm From Brazil

2.37 ct Round Cut Peridot, 4.6 mm From China

0.7 carat Marquise Cut Opal, loose Certified Opal from Australia, Natural Untreated Gem, 11.4 x 4.6 mm

2.48 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.2 x 4.1 mm

21.7 ct Black Spinel, 16 x 12.1 mm Oval Rose Cut From Thailand

6.48 ct Loose Round Agate, 10.9 mm From Indonesia

7.56 ct Oval Concave Cut Smoky Quartz, 12.1 x 10.2 mm From Brazil

2.15 ct Oval Sillimanite Cat's Eye, 6.6 x 4.6 mm From Madagascar

0.59 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.3 x 4.3 mm

4.02 ct Oval Chrysoprase, 11.1 x 9.7 mm From Madagascar

0.35 ct Baguette Cut Kornerupine, 5.8 x 3 mm From Sri Lanka

3.88 ct Green Jade, 11.8 x 9.9 mm Oval Cut From Myanmar

3.96 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 13.3 x 8.9 mm

4.95 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 12.1 x 8.3 mm

12.13 ct Green Jadeite, 18.3 x 13.2 mm Oval Cut From Myanmar

3.24 ct Round Concave Cut Mystic Quartz, 8 mm From Brazil

6.96 ct Marquise Ruby-Zoisite, 22 x 9.3 mm From Tanzania

3.17 ct Oval Cut Fire Opal, 12.5 x 9.7 mm From Mexico

1.79 ct Orange Morganite, 8 x 5.7 mm Oval Cut From Afghanistan

1.94 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.7 x 7 mm

1.61 ct Blue Apatite, 5.1 x 4 mm Oval Cut From Madagascar

3.1 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 5 mm

0.55 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gems, 4.9 x 3.1 mm

4.04 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14 x 10.1 mm

1.78 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.2 x 4.2 mm

0.99 carat Orange Spessartite Garnet, Briolette loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 6.1 mm

3.36 ct Oval Cut Golden Beryl, 9.1 x 6.9 mm From Madagascar

Gemstone Information

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