The world’s finest uncut opal, a 998-gram gem called the Fire of Australia, has gone on permanent public display for the first time since its discovery more than 60 years ago. Valued at more than $675 ...

A giant opal that weighs nearly 12,000 carats received a six-figure bid at an auction in Anchorage, Alaska. The precious stone, which is split in two, was sold for $143,750 on Sunday by Alaska Premier ...