This natural sapphire and diamond necklace from the american blue sapphire™collection strikes the perfect balance between everyday sparkle and special occasion wear. 10k yellow gold a round-cut montana sapphire shines as the light indigo centerpiece a flower-shaped halo of pavé-set round-cut diamonds surrounds the gemstone total diamond weight is 1/20 carat 16- to 18-inch adjustable cable chain; spring ring clasp from the natural precious gemstones by kay collection