At first glance, it looks like something from a sci-fi films - an entire nebula trapped inside a stone. 'The clear, transparent crystal body having a fine, firey play-of-color that is gem quality,' ...

Few realize that the world’s most famous black fire opal – the official Nevada State Gem – was discovered in Nevada’s remote Virgin Valley in 1918. Col. W.A. Roebling, a civil engineer who helped ...