18 Karat Rose Gold Diamond Small Chain Necklace This joyful necklace features rich color, unique to its wearer. This piece is embedded with a precious gold chain design and illuminating diamonds, resulting in a playful look. The Coco collection is the perfect balance of refinement and femininity in 18K gold. Coco draws inspiration from an enchanting floating star that is enraptured in a wave of impassioned color and magic.