Tiffany and Company Schlumberger 18K Yellow Gold Lapis Lazuli Tie Clip, adorned with one oval cabochon lapis weighing approx. 0.75 carat, marked: "TIFFANY 18K SCHLUMBERGER". Measuring approx. 1 7/8" x 3/16", 5.1 dwt. Provenance: From a New York City Collection. Keywords: Jewelry, Fashion, Accessories, Designer, Jean Schlumberger design, Blue, Gemstone