Gachala Emerald

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The Gachala Emerald is one of the largest emeralds in the world at 858 carats (172 g)

The Gachala Emerald, an uncut 5-cm emerald crystal weighing 858 carats (172 g). The stone was found in 1967 at Vega de San Juan mine in Colombia and is named after the mining district where it was discovered. It was donated to the Smithsonian Institution by the New York jeweler, Harry Winston.

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• Gachala Emerald