Genuine amethyst & diamond halo necklace. There is one round 4mm natural amethyst with 12 round diamonds that are about 0.05 ct tw, SI1-2 in clarity and G-H in color. The pendant dimension is 12x6.8mm in size and hangs on an adjustable 16-18" inch chain. Amethyst is the birthstone of February. Amethyst encourages the wearer humility and wisdom. It was also believed those wearing amethyst would keep their mind clear.