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 love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

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The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

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was just windowshopping and spotted a couple "Very Uncommons", a tsavorite & a demantoid garnet that were both in a size I was looking for, & that I could very easily pay for -- so figured I would grab the tsavo ASAP and got the demantoid to accompany so they wouldn't be lonely.

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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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making my own jewelry for my birth stone

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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

7.36 ct Oval Strawberry Quartz, 15.8 x 11.7 mm From Russia

0.42 ct Blue Kyanite, 3.6 mm Round Cut From Nepal

2.36 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.6 x 7.6 mm

3.33 ct Square Cut Rainbow Moonstone, 3.1 x 3.1 mm From Sri Lanka

1.75 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

2.17 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 6.9 x 6.9 mm

1.35 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18 x 3.5 mm

7.22 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 15.9 mm

1.77 ct Oval Strawberry Quartz, 8 x 6.1 mm From Russia

2.66 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7 x 6.9 mm

0.23 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.5 mm

3.11 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.2 x 8.8 mm

0.57 ct Purple Spinel, 4.8 mm Round Cut From Tanzania

6.46 ct Oval Star Ruby, 12.6 x 10.2 mm From Madagascar

3.23 carat Round Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5.1 mm

1.67 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.3 x 3.3 mm

2.18 ct Blue Apatite, 5.8 x 4.7 mm Oval Cut From Madagascar

20.8 ct Pink Coral, 21.7 x 15 mm Carved From Taiwan

6.42 ct Oval Pietersite, 16.8 x 10.4 mm From Namibia

2 ct Oval Cut Strawberry Quartz, 9.1 x 7 mm From Russia

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

0.31 ct Baguette Cut Kornerupine, 5 x 3.3 mm From Sri Lanka

3.85 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 3.9 mm

2.2 ct Oval Sillimanite Cat's Eye, 7.4 x 5.1 mm From Madagascar

1.02 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.2 mm

3.27 ct Yellow Sillimanite, 8 x 5.9 mm Oval Cut From Sri Lanka

1.02 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 5.7 mm

2.87 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

0.35 carat Purple Sapphire, Pear Shape loose Sapphire from Madagascar, Natural Gem, 5.9 x 3.9 mm

0.47 ct Loose Purple Sapphire, 5.7 x 3.7 mm Oval Cut From Madagascar

3.74 ct Oval Fire Agate, 12.2 x 9.4 mm From Mexico

2.36 ct Loose Baguette Labradorite, 8.9 x 6.9 mm From Madagascar

Gemstone Information

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