TIFFANY ''SIXTEEN STONE'' RING, EXCLUSIVE DESIGN BY JEAN SCHLUMBERGER: Lovely open band of 18k yellow gold with .80ctw of rubies and .59ctw of diamonds, G VS, prong set in platinum between yellow gold X, marked ''Tiffany Schlumberger 18k'', size 6.5, 7.5 grams. Currently retailing for $5175. Est. $3000/4000**