Opals are formed when water and silicon dioxide ... Highlights: This is an extremely rare gem in the Taaffeite family, and until recently, only eight stones were known to exist.

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 ...

coloured opal of Lightning Ridge is exceedingly rare. The traditional owners of this land have a longstanding relationship with opal. For thousands of years, stories have linked opal with the ...

The two men are standing in the middle of the sun-bleached South Australian outback, hunting for opals, the rare gemstones that can sparkle with a rainbow of different colours. They sift through ...

All opal fossils are rare - monotreme ones even more so - but these specimens are "a revelation", says Ms Smith. They take the total number of monotreme species known to have once lived at ...

Adding to the ensemble’s allure, Radhika adorned her neck with a rare blue opal necklace surrounded by diamonds, designed by Lorraine Schwartz. This necklace held deep personal significance ...

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.