NEW YORK – An Art Deco-era diamond and platinum riviere necklace, a pair of Harry Winston pearl, diamond and platinum earrings, and an 18K white gold ring centered on an unheated 19.02-carat Ceylon sapphire should all find enthusiastic new owners at Jasper52’s Exclusive Estate & Designer Jewelry auction, which will take place on Tuesday, July 12 at 3 pm Eastern time. Absentee and Internet live bidding will be available through LiveAuctioneers.