Of the total amount of opal exported, only 5.83Kg is done so after being polished, generating a mere 184,724 dollars, whilst the remaining rough stones generated 4.4 million dollars.

Opalized fossils of Weewarrasaurus pobeni, a previously unknown dinosaur, was recovered in an Australian opal field. Precious stones recovered from the opal fields of Australia have turned out not ...

Home to one of Idaho's most treasured gems — the Spencer precious opal — the town enjoys a steady stream of visitors that come to the area to dig and hunt for the multicolored gemstones. But ...

The largest and most valuable single piece of rough gem opal is the Olympic Australis, a 3.45-kilogram, 17,000-carat stone estimated to be worth about $1.9 million.

White, pink, yellow and blue opals hide in the rocky landscape of Spencer Opal Mines, the largest-producing precious opal mine in the United States.