Opal is an app designed to help you limit your screen time and restrict access to apps you find distracting. With Opal, you ...

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.

Lab-created opals: Lab-created or lab-grown opals are simply other terms used to describe synthetic opals that were man-made in a laboratory. Imitation opals: As for imitation opals, they're ...

Discover why OPAL Fuels, a leading RNG producer, presents a buying opportunity with strong revenue growth and undervaluation, ...

Opal Fuels (OPAL) announced the start of commercial operations at its renewable natural gas, or RNG, facility at the Polk County municipal ...