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

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Overall Rating -> 10

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first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

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This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

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I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

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Overall Rating -> 10

Hello: You do have good website. Vast majority of folks would buy the Gems for its spiritual, physical / energy level, emotional level positive aspects. You have only very brief mention of this aspect of each Gem ..may be you can add little bit more about ways to leverage the beneificial effect of each gems i.e. some practical tips.ThanksRupen Patel

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Overall Rating -> 10

Everthing about researching and ordering from Gemselect was easy and uncomplicated. In the past I had payment problems, but your customer rep, Thomas, helped me get everything right. I will continue using Gemselet in the future for these reasons.

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Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

0.42 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.1 x 3.3 mm

19.94 carat Pear Shape Onyx, loose Certified Onyx from Sri Lanka, Natural Gem, 24.5 x 17.8 mm

8.06 ct Round Pietersite, 18.8 mm From Namibia

0.16 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

9.38 ct Oval Pietersite, 13.9 x 10 mm From Namibia

26.6 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.9 x 16.6 mm

29.01 ct Oval Jasper, 32.1 x 12.8 mm From Indonesia

0.57 ct Octagon Cut Peridot, 6.1 x 4.1 mm From China

4.71 ct Orange Sunstone, 9 mm Round Cut From India

3.58 ct White Moonstone, 11 x 8.2 mm Oval Cut From India

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

1.15 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 8.5 x 5.2 mm

6.39 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.1 x 9.3 mm

1.19 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 6.4 x 5.8 mm

18.84 ct Oval Snowflake Obsidian, 27.5 x 19.1 mm From India

24.18 ct Gray Jadeite, 22.6 x 18 mm Oval Cut From Myanmar

3.02 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5 mm

0.73 ct Yellow Sphalerite, 5.2 mm Round Cut From Spain

3.97 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.8 mm

23.58 ct Oval Jasper, 31.1 x 20.2 mm From Indonesia

1.9 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 8.2 mm

4.64 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 11 x 9 mm

2.52 ct Round Cut Peridot, 4.5 mm From China

31.63 ct Fancy Howlite, 27.1 x 21.4 mm From the United States

1.39 ct Purple Spinel, 6.3 x 6.3 mm Cushion Cut From Tanzania

10.23 carat Orange Zircon, Oval loose Zircon from Sri Lanka, Natural Untreated Gems, 6.1 x 4.9 mm

0.51 ct Orange Sphalerite, 4.6 mm Round Cut From Spain

0.61 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

2.82 ct Green Apatite, 8.1 x 8 mm Asscher Cut From Madagascar

2.87 carat Trillion Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4 mm

0.7 ct Purple Spinel, 6.8 x 4.6 mm Octagon Cut From Tanzania

2.08 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.5 mm

Gemstone Information

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