This is an EXCEPTIONAL Topazio filigree pin. These are made in Portugal and this one is LARGE and weighty and you will see the the rose has four layers of petals leading to the bud at center. I did not detect a signature but this is definitely a Topazio piece and a nice one at that! It measures 4 1/4" long by 3 1/8" wide. It is a silver filigree with a gold wash that has mellowed, definitely.
It is in nice condition and is a statement piece you will enjoy wearing!