A solid black opal signet ring and smaller hexagonal ring, 14ct yellow gold, made as a modern smooth signet ring of wide polished form featuring a central solid black opal of intense and varied spectral colours red, blue, yellow and green throughout in broad rolling flashes, measuring 13.2 x 10.6 mm, bezel set in an open back, along with a smaller 9ct yellow gold signet also set with a solid black opal faceted into a hexagonal form claw set, blue and green colours throughout.