Spectacular emerald collection going to auction in New York A collection of rare emeralds, including one of the largest museum-quality emeralds in the world, are being auctioned in New York on 25 April 2017. The Marcial de Gomar collection includes emeralds salvaged from the wreck of the famous Nuestra Señora de Atocha, a Spanish galleon which went down with its treasure off the coast of Florida in 1622. IMAGES AND SOUNDBITES