Diameter: 6 3/8 in Pickard China is dishwasher safe for all residential grade dishwashers. Never use lemon or citrus based dishwashing powders or liquids Any Pickard pattern or custom design that is decorated with gold or platinum is NOT safe for the use in a microwave oven. When storing Pickard China in a stack, always make sure there is a protect layer ( can be a paper towel) between the items.