Chopard Ladies Necklaces. Happy Diamonds series. SKU: 799434-1201. Metal Type: White Gold. Metal Stamp: 18k. Gem stone type: Diamond. Stone weight: 0.16ct. Chopard Happy Sun Moon and Stars 18k White Gold Diamond Necklace. The 18k white gold necklace features a 42 cm chain length and 0.16 carats of white diamonds, with the dancing diamonds freely moving between two sapphire crystals to enhance their natural sparkle.