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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I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

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So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

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Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

6.17 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.4 x 10.6 mm

0.49 ct Oval Checkerboard Peridot, 6 x 4 mm From China

31.6 ct Oval Bloodstone, 35.4 x 23 mm From Madagascar

2.67 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.8 x 4.8 mm

10.16 carat Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 14.1 x 10.9 mm

2.03 carat Brown Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 8.1 x 6.1 mm

3.36 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 10.5 x 6.9 mm

5.41 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.2 x 10.1 mm

0.58 carat London Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 7.8 x 3.9 mm

0.68 ct Octagon Cut Color-Change Diaspore, 6.6 x 3.8 mm From Turkey

11.31 carat Carved Rose Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.3 x 13.6 mm

1.76 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 13.3 x 9.3 mm

1.77 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Gem, 9 x 6.6 mm

5.08 ct Round Cut Smoky Quartz, 11.7 mm From Brazil

14.48 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 21.1 x 14.6 mm

0.43 ct Pink Spinel, 4.6 x 4.4 mm Cushion Cut From Tanzania

2.04 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 7 mm

8.34 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 12.2 x 8 mm

1.5 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 8.4 x 8.1 mm

16.9 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 18 x 13 mm

5.76 ct Orange Sunstone, 8.9 mm Round Cut From India

1.34 ct Yellow Beryl, 8.4 x 8 mm Trillion Cut From Madagascar

6.12 ct Odd Shaped Rainbow Pyrite, 14.9 x 11.8 mm From Russia

1.55 carat Diamond Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 3.1 mm

2.48 ct Pink Kunzite, 8.7 x 7.2 mm Odd Shaped From Afghanistan

3.15 ct Round Cut Peridot, 5.9 mm From China

0.71 ct Oval Cut Color-Change Diaspore, 9.6 x 4.1 mm From Turkey

0.74 ct Loose Trillion Cut Mystic Quartz, 6.1 x 6 mm From Brazil

8.14 ct Round Quartz Cat's Eye, 12.1 mm From India

1.65 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

13.83 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18 x 13.8 mm

3.94 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4 mm

Gemstone Information

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