The Prague Sun is the most valuable object in a collection of the Loreto treasure. It is so called a diamond monstrance of a sun shape made of a high gilded silver from 1699. It weights over 12 kg and it is decorated by 6222 diamonds. The monstrance was created by a Viennese architect active in Prague, Jan Bernard Fischer from Erlach. Basis of the monstrance is a rock on which stays a figure of the Virgin Mary in a dynamic excited movement with a crown made of rays above her head.