10k Yellow Gold, Amethyst, and Diamond Pendant Necklace, 18" Pendant necklace in 10k gold featuring semi-precious or lab-created stone centerpiece topped with diamond-accented tiara bail The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Imported All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict-free.