Following is a transcript of the video. Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy.

The shinier the pearl, the better. Black opal is one of the rarest gemstones in the world, sought after for its seemingly infinite display of colors, compared to common opal, which is usually one ...

Yet despite appearances there is a siren’s call here. The world covets opal but the most revered is black opal – a ...

Following is a transcript of the video. Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy.

The price paid on Friday was the highest for a unit within the Opal Tower in Sydney Olympic Park since remedial works were undertaken to fix cracking that forced residents to be evacuated in 2018.

Street Talk can reveal the Sydney buyout firm has gained exclusivity over a 50 per cent stake in Australia’s largest residential aged care provider, Opal HealthCare, which was put up for sale in ...