Arthur Price of England Sovereign Silver Plate. The very best and most luxurious silver plate cutlery on the market, with a silver thickness of up to 40 microns. Unconditionally guaranteed for life and will offer a richness of patination, in time, that is beyond compare. Dishwasher Safe. Ritz, a design exclusive to Arthur Price Of England. Ritz is based on the French Empire styles of the 1780s and reflects the tastes of the court of Louis XVI.