Our ring is set with a black nephrite jade cabochon, a stone prized since ancient times that is refreshingly modern today. Since 1861, Gump's has been a destination for jewelry that is distinctive, extraordinary and timeless. Our signature collection - we develop the design, carefully select each gemstone and oversee the production from start to finish. Featuring only the finest materials, each piece is a statement of timeless elegance. Black nephrite jade, 16 x 12mm. 14-karat yellow gold.