These are an authentic TIFFANY Platinum 18K Yellow Gold Diamond Schlumberger Lynn Pendant Necklace. This gorgeous necklace is crafted of an 18 karat yellow gold chain that holds a signature Schlumberger pendant crafted of platinum and diamonds with a total approximate carat weight of .20 carats. This classic necklace will sparkle and shimmer with the unforgettable style of Tiffany!