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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Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

12.36 ct Oval Star Ruby, 14.4 x 12.5 mm From Madagascar

3.38 carat Emerald Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.8 x 3.8 mm

0.53 carat Pink Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.9 x 4.9 mm

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

0.94 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gems, 7.1 x 5.2 mm

11.75 ct Green Amazonite, 9.2 mm Round Cut From Madagascar

2.13 ct Cushion Cut Peridot, 8 x 7.1 mm From Myanmar

3.07 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 7 x 6.9 mm

3.07 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6 x 6.1 mm

3.08 ct Oval Cut Golden Beryl, 9.2 x 7.1 mm From Madagascar

1.45 carat Orange Zircon, Emerald Cut loose Zircon from Tanzania, Natural Untreated Gem, 7.1 x 4.8 mm

9.43 ct Oval Coral, 18.1 x 14.5 mm From Indonesia

9.25 ct Oval Star Moonstone, 16.4 x 10.7 mm From India

3.4 ct Orange Sunstone, 10.9 x 8.8 mm Oval Cut From India

1.8 ct Oval Sillimanite Cat's Eye, 7.1 x 4.4 mm From Madagascar

2.44 carat Round Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 5.2 mm

0.76 ct Round Cut Color-Change Diaspore, 5.5 mm From Turkey

3.22 carat Green Sapphire, Oval loose Sapphire from Tanzania, Natural Gems, 6 x 4.9 mm

1.15 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 5.8 mm

4.59 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7 x 5.1 mm

1.79 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7 mm

6.91 ct White Moonstone, 9.1 mm Round Cut From India

2.05 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.2 x 5.1 mm

0.74 carat Orange Morganite, Oval loose Morganite from Afghanistan, Natural Untreated Gem, 7.8 x 5.6 mm

4.16 carat White Topaz, Square loose Topaz from Brazil, Natural Untreated Gems, 4 x 3.9 mm

3.78 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 14.9 x 7.2 mm

7.69 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 11.1 x 9.1 mm

3.42 carat Green Fluorite, Oval loose Fluorite from India, Natural Untreated Gem, 9.7 x 8 mm

2.41 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.1 x 7.1 mm

2.25 ct Cushion Cut Peridot, 8.1 x 7.5 mm From Myanmar

1.76 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8 x 6.6 mm

0.93 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

Gemstone Information

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