Vintage Venetian brooch with fresh water Pearl. Purchased in Venice Italy

The name says Astolfo. I bought it at the tiny shop in the Venice canals it’s a bronze finish the leaves are a mesh with a diamond like crystals and there’s other beading as well as a freshwater pearl the first picture you see the beautiful brooch and then there’s a later picture where I’m pointing to one little missing Crystal but to where the boat she don’t even notice it I never noticed it until I looked really close and I actually made bought it that way I don’t know if there’s a white freshwater pearl and a dark gray one in the middle of each flower hope this finds a great home