Mr. GG2 had an 11 carat emerald from the Atocha. He finally sold it about 6 years ago.
I know one of the divers that worked for Mel. He said many emeralds were scattered during the sand removal operations where they used the ships props and a large curved “pipe” to blast the bottom clear of the sand prior to air lift vacuuming the site. It seems emeralds and sand have near the same specific gravity and all flew away together. They found many emeralds but just as many are still scattered all around there.
FRegards,SS1