"Mandarin garnet" specimens are the most in demand and the most expensive. Spessartine gem quality stones are rarely larger ...

Australia produces over 90 percent of the precious opal worldwide, and it's the country's national gemstone. Black opal, white opal and fire opals are among the most valuable.

Pearls, black opal, and chocolate diamonds are highly sought after gems. Many factors determine their value, including colors and sizes.

Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ever ...

There's a reason that Adam Sandler goes crazy for a black opal in 'Uncut Gems'. We spoke to the experts to find out what a black opal is and why black opals are so expensive ...

The Opal C1 is roughly the size of a GoPro, but it's made to deliver 4K image quality that is on par with far more expensive digital cameras.

A house in Somerset that sold for $800,000 tops the list of the most expensive residential real estate sales in Franklin ...

An extensive and valuable opal collection considered the premier opal collection in the 1980s is up for auction and could be lost for the people of Australia.