The back of this pin is marked Made In China -- I am confident it is silver.  It is a older  piece that is 1 1/2" x 1", and is hand made flowers on the front.  In the center is a carved ivory piece that has been vibrantly dyed. It is held in place with prongs.  A beautiful piece that also came from an estate I purchased that was primarily antique Orientalia.  $145.00