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 ...

Where to begin with this story? There’s the soap opera angle, reportedly involving bitter infighting among city politicians over a precious gem thought by at least one person to be bad luck. There’s ...

The beautiful optical properties of the gemstone opal are the result of tiny amounts of uranium present when the stones were formed, say researchers in Australia. They claim that their work could lead ...