Tiffany & Co 18K Gold Diamond Sapphire Choker Necklace. The piece is in excellent estate condition and ready to wear. It is signed "Tiffany & Co 750". The piece is set with approximately 1.25 carats of diamonds and blue sapphires (.56 carats of sapphires, .70 carats of diamonds). The diamonds are Vs clarity, E/G color. There are 8 sapphires and 7 diamonds. The necklace measures 15.5" long and weighs 26.3 grams.