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Explore Black Opal, Crystals Gemstones Opals, and more!

Pearls are the most valuable of all organic gemstones, and have been prized for 6000 years. Pearls chemical makeup varies by region and environmental factors, but the basic formula is CaCO3. Pearls form through irritants entering specific species of mollusks (oysters, clams, muscles, etc), while the irritant can be a grain of sand or a parasite, the process is the same for pearls. The irritant is coated in CaCO3(mother of pearl) to make it less irritating to the mollusk. (...)

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5.44cts Yellow Natural Opal Mexico (Video Inside)

NATURAL SOLID CRYSTAL BOULDER OPAL

This Boulder Opal is named 'The Galaxy' and is possibly the finest Boulder ever found. It weighs a staggering 2600 carats.

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Boulder Opal Rough Gr440 - Buy Rough Opal Product on Alibaba.com

Boulder Opals