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Blue gemstone is oldest known piece of earth

A 4.4-billion-year-old gem found on an Australian sheep ranch is the oldest known piece of Earth yet found. Scientists using two different age-determining techniques have shown that a tiny zircon crystal found on a sheep ranch in Western Australia is the oldest known piece of our planet, dating to 4.4 billion

Gem-studded teeth show skill of ancient dentists

Advanced dentistry techniques allowed Native Americans to inset gemstones to their teeth as far back as 2,500 years ago. The early dentists used a drill-like device with a hard stone such as obsidian, which is capable of puncturing bone. "It's possible some type of [herb based] anesthetic was applied prior to drilling

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