Calibrated Heart Shape Gemstones 12 x 12 mm size from GemSelect

Some people by gems by color or price, but for many, it may be better to buy gems by size - especially if you're in need to a gem to replace another previous item that was lost or damaged: Calibrated heart shaped facet cut gems and cabochon gems in 12 x 12 mm size. Buy a wide range of calibrated gemstones by size at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not meant nor 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 around 0.3 mm or slightly higher even. This small variance can usually be accommodated for 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 Heart Shape 12x12 mm Gems

18.31 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gem, 24.5 x 17.7 mm

3.37 ct Multicolor Mystic Quartz, 8.1 mm Round Concave Cut From Brazil

2.78 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.4 x 8.5 mm

1.23 ct Yellow Beryl, 8.1 x 7.9 mm Trillion Cut From Madagascar

2.54 ct Loose Briolette Sapphire, 3.6 mm From Madagascar

3.29 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6 x 6.1 mm

3.71 ct Oval Strawberry Quartz, 10.1 x 8.1 mm From Russia

0.23 ct Round Cut Iolite, 4.2 mm From Madagascar

62.82 ct Oval Serpentine, 40.3 x 27.8 mm From the United States

0.85 carat Yellow Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 7.8 x 5.9 mm

24.04 ct Square Hematite, 16.2 x 15.9 mm From Brazil

0.79 ct Loose Gray Spinel, 5.3 x 4.6 mm Cushion Cut From Tanzania

1.57 ct Blue Kyanite, 8.1 x 6.1 mm Oval Cut From Nepal

0.83 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

0.67 ct Loose Violet Sapphire, 6.3 x 4.3 mm Oval Cut From Tanzania

2.28 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.8 x 7.1 mm

1.17 ct Loose Yellow Sapphire, 5.7 mm Round Cut From Tanzania

0.54 ct Loose Orange Sapphire, 5.9 x 3.9 mm Oval Cut From Tanzania

0.94 ct Loose Pink Sapphire, 8.8 x 5.2 mm Odd Shaped From Madagascar

1.81 ct Octagon Cut Smoky Quartz, 10.2 x 4 mm From Brazil

7.53 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.1 x 9.2 mm

6.44 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 15.2 mm

1.4 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8 x 6.1 mm

34.55 carat Pear Checkerboard Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 37 x 28.8 mm

6.62 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

2.35 ct Oval Strawberry Quartz, 9.1 x 7.1 mm From Russia

1.62 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gems, 8.1 x 6 mm

0.84 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4 mm

1.3 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gem, 6.9 x 6.9 mm

4.33 ct Square Cut Peridot, 6 x 6 mm From China

2.2 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 4.8 mm

3.87 carat Square Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 6 mm

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