A rare square 37-carat emerald owned by the Aga Khan fetched nearly $9 million at auction in Geneva on Tuesday, making it the world's most expensive green stone. Sold by Christie's, the Cartier ...
A RARE square 37-carat emerald owned by the Aga Khan fetched nearly US$9 million at auction in Geneva on Tuesday (Nov 12), making it the world’s most expensive green stone. Sold by Christie’s, the ...