Pendant Necklace. This Authentic TIFFANY & CO. Platinum .50 Carat Diamond Solitaire Necklace was purchased in 2011 in Paris in the fashionable shopping district Paris Rue de la Paix at Tiffany & Co. store located at 6 rue de la Paix, Paris 75002. The chain is stamped Tiffany & Co. PT 950 and the pendant has a serial # 27961797. The pendant is a platinum 4 prong setting featuring one round brilliant diamond measuring approximately 5.15 mm x 3 mm, weighing an estimated .50 Carats, J color, VSS2 clarity and together with the 16" chain weighs approximately 2.8 grams. The pendant comes in a velvet lined hinged display box with the blue suede drawstring Tiffany pouch in the original Tiffany box. This beauty shows little to no signs of wear and is accompanied with the original receipt in the Tiffany folder.