This is a great rectangular silver? brooch with fancy twist wire fretwork inside, mixed with different size red and green rhinestones. The stones are set in a ridged frame. It has two chain swags with three teardrop rhinestones set in the same type frames. All the stones have a nice cut. It is about 1/4" thick. 2 1/2" by 1 1/2". excluding the swags. It has an open latch. The marks on the back are GD&Co. Also what looks like a clover with a crown in each leaf. Another mark is G7. All marks are incised. I would like to know who the maker is, the age, If it is indeed silver, and a value or estimated value. I will appreciate any information about this lovely piece. Thank you so much.