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

0.42 carat Pear Shape Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.2 x 4 mm

5.63 carat Blue Green Apatite, Cushion loose Apatite from Madagascar, Natural Gem, 15.9 x 7.9 mm

35.21 ct Druzy Citrine, 32.2 x 15.3 mm From Uruguay

0.92 ct Oval Cut Kornerupine, 7.1 x 5.3 mm From Sri Lanka

24.61 ct Oval Jasper, 32.3 x 20.1 mm From Indonesia

67.28 ct Druzy Citrine, 35.3 x 22.6 mm From Uruguay

0.05 ct Green Diamond, 2.3 mm Diamond Cut From India

3.53 ct Pink Kunzite, 9.1 x 7.1 mm Cushion Cut From Afghanistan

1.09 ct Blue Kyanite, 6.1 mm Round Cut From Nepal

8.93 ct Oval Prehnite, 8.5 x 7.2 mm From South Africa

13.81 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 25.7 x 15.7 mm

0.52 ct Loose Purple Sapphire, 4.6 mm Round Cut From Madagascar

0.87 ct Yellow Beryl, 7.1 x 6.9 mm Trillion Cut From Madagascar

52.7 ct Oval Jasper, 35.5 x 16.9 mm From Mexico

15.46 carat Carved Rose Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.2 x 15.2 mm

0.84 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 7 x 4.9 mm

0.79 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.8 x 4.7 mm

0.31 carat Pear Shape Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.1 x 3.8 mm

0.79 ct Blue Kyanite, 5.8 mm Round Cut From Nepal

1.95 ct Cushion Cut Peridot, 8 x 7.4 mm From Myanmar

1.58 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5 x 4.9 mm

8.01 ct Rainbow Pyrite, 21.4 x 16.5 mm From Russia

0.95 ct Octagon Cut Color-Change Diaspore, 6.4 x 5.8 mm From Turkey

4.24 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 5 mm

9.39 ct Oval Pietersite, 13.6 x 10.3 mm From Namibia

0.82 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gems, 6.8 x 5.1 mm

2.84 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 8 x 6 mm

4.83 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.1 x 10.1 mm

430.86 ct Oval Star Rose Quartz, 46.2 x 37.1 mm From South Africa

1.4 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

11.38 ct Round Agate, 13.1 mm From Indonesia

1.26 ct Round Checkerboard Smoky Quartz, 7.1 mm From Brazil

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