Aga Khan emerald, world’s most expensive green stone, fetches record $9 million at auction
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 diamond and emerald brooch, which can also be worn as a pendant, dethrones a piece of jewelry made by the fashion house … Read more