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

15.74 carat Pear Howlite, loose Certified Howlite from the United States, Natural Untreated Gem, 22.2 x 17.3 mm

0.47 ct Orange Sphalerite, 4.7 mm Round Cut From Spain

3.07 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9 x 7.1 mm

0.08 ct Black Diamond, 1.9 mm Diamond Cut From India

1.09 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 7.7 x 6 mm

8.87 ct Asscher Cut Rose Quartz, 12.9 x 12.8 mm From South Africa

0.79 ct Oval Cut Fire Opal, 7.8 x 5.9 mm From Mexico

15.43 ct Oval Cut Strawberry Quartz, 17.7 x 13.6 mm From Russia

2.2 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 6.2 x 6 mm

1.72 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5.1 mm

0.86 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.4 x 6 mm

13.49 ct Baguette Lapis Lazuli, 15.4 x 11.3 mm From Afghanistan

24.36 ct Square Hematite, 15.5 x 15.5 mm From Brazil

0.4 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.2 x 3.5 mm

0.47 ct Loose Pink Sapphire, 5.9 x 4.1 mm Oval Cut From Madagascar

1.44 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10 x 8 mm

0.05 ct Black Diamond, 2.1 mm Diamond Cut From India

0.86 ct Oval Cut Carnelian, 7.8 x 6 mm From India

2.58 ct Oval Cut Strawberry Quartz, 8.1 x 6.2 mm From Russia

2.82 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

2.99 carat Cushion Opal, loose Certified Opal from Australia, Natural Untreated Gem, 16.7 x 8.1 mm

6.48 ct Trillion Onyx, 9.9 x 9.4 mm From Sri Lanka

1.38 ct Baguette Cut Color-Change Diaspore, 10.8 x 4 mm From Turkey

1.33 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11 x 7.4 mm

0.69 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

2.66 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 7.5 x 6.9 mm

5.66 ct Oval Actinolite Cat's Eye, 13 x 10.1 mm From the United States

1.1 ct Oval Cut Peridot, 7.4 x 5.6 mm From China

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

1.85 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7 mm

1.86 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 7 mm

0.82 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 8.4 x 4.6 mm

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