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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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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making my own jewelry for my birth stone

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Gemselect is a good website with a great selection of loose gems for sale. The prices are fairly decent, with the only negative being the cut quality of the gems. This is my go to retailer for gemstones and will continue to be, given that the packages arrive in a timely manner.

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Gemstones A-Z

Buy Heart Shape 12x12 mm Gems

1.02 ct Purple Spinel, 7.1 x 5.1 mm Oval Cut From Tanzania

23.24 ct Marquise Hematite, 26.5 x 12.1 mm From Brazil

11.39 ct Cushion Obsidian, 22.6 x 11.6 mm From the United States

0.44 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.6 x 4 mm

3.41 ct Marquise Pietersite, 16.6 x 6.7 mm From Namibia

0.62 ct Orange Sphalerite, 5.4 x 4.5 mm Oval Cut From Spain

3.35 ct Marquise Rutile Quartz, 13.8 x 6.9 mm From India

1.13 ct Loose Yellow Sapphire, 7.5 x 5 mm Cushion Cut From Tanzania

1.73 ct Orange Coral, 10.9 x 5.5 mm Oval Cut From Australia

2.61 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 6.1 x 4 mm

9.31 ct Yellow Quartz, 12.1 x 10.6 mm Octagon Cut From Brazil

2.55 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.6 x 7.9 mm

1.52 ct Blue Star Sapphire, 7.1 x 5.2 mm Oval Cut From Thailand

8.62 carat Blue Green Apatite, Pear Shape loose Apatite from Madagascar, Natural Gem, 17.6 x 9.7 mm

3.06 ct Oval Rutile Quartz, 10.1 x 7.9 mm From India

3.01 ct Oval Tiger's Eye, 8.8 x 6.8 mm From Thailand

4.42 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 9.9 mm

14.92 ct Fancy Quartz With Marcasite, 22.3 x 15.7 mm From Brazil

3.46 ct Diamond Cut Andalusite, 3.7 mm From Brazil

1.05 ct Blue Kyanite, 7.1 x 5.1 mm Oval Cut From Nepal

2.67 ct Yellow Sphene, 8.6 x 8 mm Oval Cut From Sri Lanka

1.69 ct Orange Moonstone, 6.1 x 6.1 mm Square Cut From India

1.5 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 5.2 mm

3.72 carat Pink Morganite, Pear loose Morganite from Afghanistan, Natural Untreated Gem, 12.8 x 8.8 mm

2.72 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7 x 7.2 mm

7.03 ct Round Larimar, 12.1 mm From the Dominican Republic

27.98 ct Green Aventurine, 32.8 x 19.3 mm Oval Cut From Brazil

27.38 ct Yellow Quartz, 19.1 x 19.1 mm Cushion Checkerboard From Brazil

2.93 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 8.4 x 6.8 mm

5.23 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8.8 x 7 mm

0.99 carat Blue Green Grandidierite, Pear loose Grandidierite from Madagascar, Natural Untreated Gem, 6.9 x 5.8 mm

1.09 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 6.9 x 5.7 mm

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