Green Malachite Bezel Set Oval Stone 925 Sterling Silver Brooch. The Filigree Setting measures about 1-3/8X 7/8".
The stone measures about 3/4 X 1/2". I believe it is called malachite, but I am not a gem expert. The back of the pin is marked 925 as shown. It is in great pre-owned condition, as shown.