Elks B.P.O.E. 20 Year service / member pin

Vintage Elks Lodge Tie Tac B.P.O.E.. Benevolent and Protective Order of Elks Vintage Elks Lodge Tie Tac/Pin, marking 15 years of membership ?Not sure if this is a Rhinestone, or amethyst between its eyes. The background is a deep royal blue but shows lighter in the photo. 3 dimensional. This is so nice and in great condition. Measures 5/8"dia.