For centuries, humans have lived underground. Today, that ancient practice is under dire threat—even as cave life makes more ...

Prospecting for fire opal in Queretaro, Mexico The Gem Odyssey Two gemologists, Carlos Torres and Laurent Massi, have created “The Gem Odyssey,” a company that provides private excursions to ...

Gemstones are precious, especially when they come filled with dinosaur bones. Back in the 1980s, a miner unearthed a slew of fossils preserved in opals in an opal mine near Lightning Ridge in ...