Necklace Information Metal: White Gold Karat: 18K Pendant Length: 18 in Pendant Width: 6 mm Chain Information Clasp: Lobster Center Gemstone Type: Diamond Shape: Oval Number: 1 Carat Weight: 0.4 Model Number 111432AWCHX0 Item Information This delicate diamond solitaire necklace from Roberto Coin features a .40 carat bezel set oval diamond presented on an 18" chain in 18K white gold. All white gold and sterling silver is presumed to be rhodium plated