I think this piece was made in the late Edwardian, early deco period. It’s large for Edwardian, and not as delicate as a lot of the pieces from that era. The sterling silver mimics the use of platinum, where diamonds were in very fine settings that often made the stones look as though they were suspended. This type of work was typical of the Edwardian period. French hallmarks. In this piece, the centre corona surrounding the faux pearl looks as though it is floating but it is anchored at each point to the surrounding silver.