Calibrated 20 x 15 mm Oval Shape Natural Loose Gemstones: GemSelect

Some people by gems by color or pricze, 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 20 x 15 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 20x15 mm Gems

1.83 carat Baguette Cut Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 6.9 mm

0.93 carat Red Spessartite Garnet, Briolette loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 6.6 mm

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

2.79 ct Oval Black Opal, 9.2 x 7.1 mm From Ethiopia

2.54 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

3.03 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 9.2 x 9.1 mm

1.78 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 9.9 x 7.9 mm

1.21 ct Pink Morganite, 8 x 5.9 mm Oval Cut From Afghanistan

0.98 ct Green Sphene, 6.2 x 5.1 mm Oval Cut From Sri Lanka

3.09 ct Square Cut Rainbow Moonstone, 3.1 x 3 mm From Sri Lanka

0.62 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8 x 4 mm

1.09 ct Purple Spinel, 6.9 x 5.8 mm Oval Cut From Tanzania

13.49 carat Bi-color Ametrine, Cushion Concave Cut loose Ametrine from Brazil, Natural Untreated Gem, 17.1 x 12.9 mm

1.11 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 5 mm

1.26 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 6.9 x 5 mm

3.51 carat White Topaz, Round loose Topaz from Brazil, Natural Untreated Gem, 9.1 mm

44.27 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 26.5 x 18.1 mm

40.77 ct Oval Jasper, 36.7 x 23.7 mm From Indonesia

0.58 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 7.3 x 4.6 mm

0.88 ct Loose Pink Tourmaline, 6.5 x 5.8 mm Oval Cabochon From Mozambique

18.16 ct Yellow Quartz, 18.3 x 13.6 mm Oval Cut From Brazil

6.66 ct Carved Prehnite, 17.4 x 11.1 mm From South Sea

2.97 ct Green Agate, 10.2 x 7.3 mm Oval Cut From India

0.64 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gem, 5.2 x 5 mm

0.54 ct Loose Yellow Sapphire, 4.6 x 4.6 mm Cushion Cut From Tanzania

1.79 ct White Morganite, 9.1 x 7 mm Oval Cut From Afghanistan

3.41 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.8 x 8.9 mm

3.19 ct Oval Prehnite, 9.4 x 8.3 mm From South Africa

1.21 ct Oval Cut Peridot, 7.6 x 5.7 mm From China

1.96 ct Oval Spectrolite, 9.8 x 8.3 mm From Finland

1.54 ct Oval Sillimanite Cat's Eye, 7.8 x 5.7 mm From Madagascar

2.68 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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