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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I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

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Gemstones A-Z

Buy Oval Shape 20x15 mm Gems

0.75 ct Cushion Cut Color-Change Diaspore, 5.7 x 4.6 mm From Turkey

13.13 ct Black Spinel, 12 mm Round Rose Cut From Thailand

1.51 ct Purple Spinel, 7 x 6 mm Cushion Cut From Tanzania

0.52 ct Loose Orange Sapphire, 5.8 x 3.8 mm Oval Cut From Tanzania

19.68 ct Oval Tiger's Eye, 24.7 x 16.6 mm From Thailand

4.58 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 10.9 x 5.7 mm

2.55 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gems, 10.2 x 5.1 mm

0.4 ct Loose Purple Sapphire, 5.8 x 4 mm Oval Cut From Madagascar

7.16 ct Oval Cut Strawberry Quartz, 11.1 x 8.9 mm From Russia

1.95 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 8.2 mm

1.47 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 5 mm

3.36 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 mm

2.13 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 6.1 mm

17.16 ct Carved Rubellite Tourmaline, 15 x 14 mm From Mozambique

18.98 ct Oval Coral, 25.9 x 20.1 mm From Indonesia

3.7 carat Pink Topaz, Cushion loose Topaz from Brazil, Natural Gem, 10.2 x 8.1 mm

21.97 carat Cushion Ammolite, loose Certified Ammolite from Canada, Natural Gem, 26.2 x 18.7 mm

0.49 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.1 x 4.1 mm

22 ct Oval Rose Quartz, 20 x 16.8 mm From South Africa

3.13 carat Blue Sapphire, Princess-Cut loose Sapphire from Madagascar, Natural Gems, 2.7 x 2.6 mm

5.73 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.2 x 9.1 mm

3.39 ct Oval Prehnite, 9.6 x 7.6 mm From South Africa

36.54 ct Baguette Hematite, 17.1 x 12.9 mm From Brazil

0.8 ct Pink Spinel, 5.8 x 4.9 mm Cushion Cut From Tanzania

1.25 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.1 x 4 mm

2.08 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.4 x 6.8 mm

1.48 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gems, 6.2 x 6 mm

0.94 ct Loose Yellow Sapphire, 2.7 x 2.6 mm Princess Cut From Tanzania

0.02 ct Loose Blue Diamond, 2 mm Diamond Cut From India

2.16 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.3 x 7.3 mm

29.1 ct Pencil Cut Jasper, 38.8 x 9.6 mm From Indonesia

5.06 ct Loose Pear Dendritic Agate, 14.2 x 10.2 mm From India

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