Calibrated Size for Octagon Cut Gemstones 16x12 mm

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 Octagon shape / Emerald-Cut, faceted and cabochon gems available now in 16 x 12 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 Octagon Shape 16x12 mm Gems

32.86 ct Oval Charoite, 30.1 x 22.2 mm From Russia

3.17 ct Orange Moonstone, 8.1 x 7.9 mm Trillion Cut From India

1.32 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6 x 5.9 mm

5.83 ct Oval Fire Agate, 12 x 10.1 mm From Mexico

0.32 ct Baguette Cut Iolite, 5 x 2.9 mm From Madagascar

2.48 carat Blue Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 9.7 x 7 mm

6.22 ct Oval Tiger's Eye, 10.3 x 8.2 mm From Thailand

1.8 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8 x 7.1 mm

5.76 ct Trillion Fire Agate, 17.7 x 10.6 mm From Mexico

2.46 ct Oval Strawberry Quartz, 9 x 7.1 mm From Russia

3.55 carat Half Drilled Briolette Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11 mm

3.28 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.6 x 8.5 mm

0.97 ct Yellow Beryl, 8 x 6 mm Oval Cut From Madagascar

9.02 ct Asscher Cut Smoky Quartz, 12.1 x 12.1 mm From Brazil

2.16 ct Round Onyx, 5.6 mm From Sri Lanka

1.65 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8.2 x 6.1 mm

23.49 ct Oval Jasper, 30 x 19.5 mm From Indonesia

1.08 ct Loose Yellow Sapphire, 5.6 mm Round Cut From Tanzania

1.84 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

26.35 ct Oval Checkerboard Labradorite, 25.8 x 18.4 mm From Madagascar

4.63 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.3 x 10 mm

6.32 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12.2 mm

15.93 carat Pear Fossil Coral, loose Certified Fossil Coral from Indonesia, Natural Untreated Gems, 20.2 x 11 mm

0.52 ct Loose Yellow Sapphire, 4.5 x 4.5 mm Heart Cut From Tanzania

0.87 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 5.1 x 3.1 mm

11.9 ct White Quartz, 15.1 x 15 mm Asscher Cut From Brazil

3.74 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.1 x 6.2 mm

0.16 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

2 ct Oval Cut Peridot, 7.8 x 7.3 mm From Myanmar

8.63 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 13.7 x 8.1 mm

1.84 ct Blue Star Sapphire, 6.9 x 5 mm Oval Cut From Madagascar

2 ct Cushion Cut Peridot, 7.1 x 7 mm From Myanmar

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