From magnificent jewels in New York to a virtual marketplace for everything, including hand-written lyrics, one sale is by Sotheby's, the other by Invaluable.
Reza, whose elite clientele included the ill-fated Dodi al-Fayed and Princess Diana, amassed one of the world's most impressive collections of gemstones.
A new per-carat record price (US$3.6 million) for a diamond was established when Sotheby's sold a vivid 12.03-carat diamond dubbed "Blue Moon" in Geneva.