Sotheby's has already sold NFTs, the ubiquitous digital objects that are linked to pieces of art or other items, for millions of dollars over the past year

The stone is the "largest internally flawless step cut vivid blue diamond" ever graded by the Gemological Institute of America, the auctioneers said

Hong Kong office will stage its first tea auction online from December 8-16, offering antique and vintage teas. It said premium pu-erh from China has become highly sought after.