Vintage Charles Lyster & Son BIRMINGHAM - ca. 1890''s - 1920s Hallmarked ring 9k, UK Birmingham hallmarks. Stone is NOT a diamond (glass) and it is 1 carat, size is 8. See my other listings for sterling silver, solid 10k, 10kt, 417 , 585, solid 14k, 14kt solid 18k, 18kt, diamonds, sapphire, alexandrite, emerald, garnet, jade, amethyst, citrine, ruby, topaz, camphor glass, other precious stones, and other jewelry such as Victorian, vintage, retro and more like Kay''s, Jared, Zales, engagement, anniversary, birthday, diamonds and clusters.