Atocha Star Emerald

The Atocha Star is a 400-year-old emerald, weighing more than 25.87 carats (5.174 g) before being cut to 12.72 carats (2.544 g). The emerald is estimated to be worth between $3.2 and $5 million (USD). It was part of the treasure on board the ship Nuestra Señora de Atocha, also referred to as the Atocha. The Atocha was the largest Spanish treasure galleon in a fleet of twenty-eight ships bound for Spain which sank along with seven others in a hurricane on September 6, 1622. It sank with the Atocha Star emerald, the highest graded emerald of all Atocha Emeralds.