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.

Villagers in Ethiopia uncover rare black opal nearly 10,000 ft high, reshaping the global gem market with vibrant stones.

Opal’s first webcam looked great — and was a pain. For the company’s second effort, it made everything smaller, better, and simpler. Opal’s first webcam looked great — and was a pain. For the ...

Many people want to develop better screen-time habits, but don’t have a good set of tools to do so. A new startup, Opal, aims to help. The company, now backed by $4.3 million in seed funding, has ...