Hans Schmaltz, crown, 1566, Fribourg, Switzerland, gilt-copper, rock crystal, imitation pearls and foiled glass pastes, 14 x 18.3 x 18.3 cm, Victoria & Albert Museum, London. Source

In the mid-16th century, after the Counter Reformation, the subject of the Virgin Mary being crowned by Christ as the Queen of Heaven became extremely popular in Catholic imagery. This object is likely to have been placed on a statue of the Virgin.