The pin looks like it might of been a badge at one time. It is 2 1/8 inches long by 1 5/8 inch wide. The brooch has remnants of soft solder at the back and the pin is a newer addition. The piece is not marked but tests positive for silver sheeting on top of a yellow metal, possibly brass. The genuine turquoise cabs are knife set in and range in size from 2-4mm. Condition is good. C. 1880 and French.