(IDEX Online) - A 73.11-carat fancy vivid yellow diamond will lead The Roaring Twenties 2.0 auction at Sotheby's New York next month.The Sienna Star, a VS2-clarity, natural color, cut-cornered square step-cut stone, is set in 18 karat white gold ring with about 4.45 carats of near-colorless F-G color, VS clarity diamonds.It is a described as one of the most important creations by London-based master jeweler Glenn Spiro, and has a $3m estimate. Sotheby's say it has the highest GIA color grading for any yellow diamond, and is one of the largest fancy vivid yellow diamonds ever to be auctioned.The sale, on 9 June, is one of nine auctions being held as part of the auction house's Luxury Week, spanning the fastest growing categories of luxury items. It also features designs from Cartier, Van Cleef & Arpels, Bulgari, and others which are destined, says Sotheby's, to be worn for The Roaring Twenties 2.0.