Calibrated 14 x 12 mm Octagon Shape Gemstones from 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 Octagon shape / Emerald-Cut, faceted and cabochon gems available now in 14 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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Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

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Gemstones A-Z

Buy Octagon Shape 14x12 mm Gems

22.86 ct Drilled Sphere Rutile Quartz, 11.7 mm From India

3.97 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.5 x 9.5 mm

6.04 ct Octagon Concave Cut Smoky Quartz, 12 x 12 mm From Brazil

19.78 ct Orange Moonstone, 42.6 x 17.9 mm Carved From India

2.03 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.6 x 7.2 mm

1.2 ct Oval Strawberry Quartz, 7.7 x 5.9 mm From Russia

4.44 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.9 x 7.9 mm

31.1 ct Oval Checkerboard Labradorite, 28.2 x 21.3 mm From Madagascar

30.49 ct Oval Howlite, 30.4 x 22.2 mm From the United States

0.66 ct Blue Kyanite, 5.2 mm Round Cut From Nepal

1.93 ct Pink Morganite, 8.4 x 8 mm Trillion Cut From Afghanistan

2.52 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.1 x 7.6 mm

17 ct Oval Jasper, 20.2 x 15.2 mm From Indonesia

27.54 ct Oval Fossil Coral, 20.3 x 12.6 mm From Indonesia

2.64 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9.3 x 7.7 mm

0.38 carat Pink Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.9 x 4.5 mm

1.74 carat Square Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 7.1 x 7 mm

5.2 ct Oval Chrysoprase, 12 x 10.2 mm From Madagascar

29.62 ct Marquise Hematite, 28.5 x 13.5 mm From Brazil

52 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 24.9 x 21.3 mm

3.36 ct Oval Prehnite, 9.4 x 8.4 mm From South Africa

2.22 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 8.1 x 6.1 mm

0.49 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 5.8 x 3.9 mm

2.47 ct Cushion Cut Peridot, 9.3 x 7.2 mm From Myanmar

5.35 ct Asscher Cut Rose Quartz, 11.2 x 11.1 mm From South Africa

16.79 carat Pear Shape Amethyst, loose Certified from Brazil, Natural Untreated Gem, 21.2 x 15.8 mm

14.89 ct Oval Agate, 15.6 x 15.4 mm From Indonesia

6.94 ct Princess Cut Rose Quartz, 11.4 x 11.4 mm From South Africa

2.39 carat Swiss Blue Zircon, Oval loose Zircon from Cambodia, Natural Gems, 4.9 x 4 mm

7.41 ct Rainbow Pyrite, 19.2 x 10 mm From Russia

3.38 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6 x 4.1 mm

46.16 ct Oval Rhodochrosite, 39.1 x 16.4 mm From South Africa

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