An ancient miner shows gem hunters a photo of a legendary stone - rumored to be the world's largest Tanzanite - that has sparked rumors and folk stories for over 40 years.
Don Kogen meets with a man in Thailand to explore finding rare sunset rubies.
Gem guys Don and Gavin share the inside scoop on their wild Himalayan adventure.
What error was made to make this hefty gemstone practically worthless?
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