Money ‘A work of art’: Rare, pink diamond could fetch more than $21 million at auction September 1, 2022Natalie Neysa Alund, USA TODAYComments Off on ‘A work of art’: Rare, pink diamond could fetch more than $21 million at auction The single-lot rare pink diamond sale, orchestrated by Sotheby's Auction House in New York, is set for Oct. 5 in Hong Kong.