Jean Schlumberger for Tiffany & Co. Pair of diamond 'Twenty Stone' hoop earrings, each half hoop designed as a series of five pairs of claw-set brilliant-cut diamonds between X-shaped wire motifs, the diamonds together weighing approximately 1.80 carats, mounted in platinum, width 22 mm, post and scroll fittings, signed Schlumberger Studios, Tiffany & Co., notes, a Schlumberger classic, this iconic design is strongly defined by a repeating X, an ideogram for harmony and balance.