An Andrew Grima dress ring,

細節
An Andrew Grima dress ring,
the oval amethyst single stone with diamond set marquise shape twin claw setting, and with textured rod design mount and shank, with maker's mark H J Co and applied GRIMA plaque, the leather pouch with silver-gilt tag bearing full signature, H J Co maker's mark, and hallmark for London 1966.
See plate 8