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

16.54 carat Pear Obsidian, loose Certified Obsidian from the United States, Natural Untreated Gem, 25.9 x 18.9 mm

3.15 ct Round Cut Golden Beryl, 8 mm From Madagascar

2.21 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 4.8 mm

0.07 ct Green Diamond, 2.7 mm Diamond Cut From India

25.04 ct Oval Jasper, 25.5 x 20.4 mm From Indonesia

0.54 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 5.7 x 4.1 mm

7.7 ct Rainbow Pyrite, 16 x 15.7 mm From Russia

1.05 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 6.9 x 5.6 mm

2.02 ct Loose Orange Moonstone, 9.1 x 7.2 mm Cushion Cut From India

4.41 ct Octagon Cut Rose Quartz, 9.8 x 9.8 mm From South Africa

3.1 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.1 x 3.2 mm

2.25 ct Orange Coral, 12.2 x 4.9 mm Oval Cut From Australia

0.58 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 3.9 mm

0.73 carat Opal, loose Certified Opal from Ethiopia, Natural Gem, 8.6 x 8 mm

1 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 6 x 6 mm

4.59 ct Diamond Cut Smoky Quartz, 11.2 mm From Brazil

2.04 ct Orange Sunstone, 8.6 mm Round Cut From India

0.67 carat Blue Tanzanite, Marquise Cut loose Tanzanite from Tanzania, Natural Gems, 7.2 x 3.4 mm

11.4 ct Oval Star Ruby, 13.9 x 11.3 mm From Madagascar

2.24 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7 x 5.1 mm

6.3 ct Odd Shaped Fire Agate, 16.1 x 9.6 mm From Mexico

2.61 carat Yellow Citrine, Carved Flower loose Citrine from Brazil, Natural Untreated Gem, 8.5 x 8.5 mm

2.39 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9 x 7.3 mm

3.11 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 7.9 x 6.1 mm

3.14 ct Round Onyx, 7 mm From Sri Lanka

0.84 ct Loose White Sapphire, 4.5 mm Diamond Cut From Madagascar

1 ct Blue Kyanite, 6.9 x 5.1 mm Oval Cut From Nepal

2.57 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 7 x 5.2 mm

1.93 ct Oval Cut Andalusite, 5.9 x 4 mm From Brazil

22.48 ct Cushion Fossil Coral, 16.6 x 12.5 mm From Indonesia

7.4 ct Princess Cut Rose Quartz, 11 x 10.9 mm From South Africa

1.42 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.4 x 6.2 mm

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