I don't think it is the pearl and diamond brooch from Queen Mary.
It is an other brooch (Not the same shape)
Franck
--Previous Message-- : : It is a very attractive brooch which I like : a lot. A distinctive way of using a single : pearl effectively. : : --Previous Message-- : Just another example of beautiful jewelry : that : rarely sees the light of day.....it's always : a treat to see pictures of things i had : forgotten about.....and seeing these pics : makes me go back and pour through Fields : and, to a much lesser extent, Menkes..... : : :