Vintage Sterling Silver and Marcasite Pendent

This piece is exquisite and in beautiful condition. Marcasite is a semi-precious stone. This measures 3 1/4" tall and 1 3/4' wide. My guess is that is from the '20s that is the 1920's. There is a jewelry stamp next to the 925 too small to read, ut nay be a CR. Marcasite was very popular in the 18th century, the Victorian era, and with Art Nouveau Jewelry designers.