I believe these to be made by Cambridge, but I'm not 100% sure. They are free of chips, cracks and stains.There are however, lite utensil marks on some of them.They will glow under black light. They are sold as a 6-piece and not separate. Each plate measures at 7.5 inches. And weighs 11 oz. each. Sold as is. Please check out my large selection of other uranium glass, available for sale, in my eBay store-serenasoddittiesandfinds