Switch it up with this sterling silver signet ring. Featuring an octagon cut natural onyx, this chunky piece is a timeless statement. Rhodium plated for a durable finish, add this classic to your collection. Size: 16 mm (0.63 in). Material: Sterling Silver. Total metal weight: 8.8 gr. Radiant cut onyx (14 x 10 mm) = 7 ct total. Colour: Black. Stone cut: Radiant Cut. Occasion: Father's Day. Anniversary: 7th Anniversary.