Platinum and 18ct gold, diamond, ruby and sapphire ring, circa 1890 Set to the top with a curved plaque centring an oval-cut ruby weighing approximately 0.60 carat, an old European-cut diamond weighing approximately 0.95 carat and an oval-cut sapphire weighing approximately 0.70 carat, all framed by pave-set circular-cut diamonds together weighing approximately 1.30 carats, size O.