Castlecliff brooch and matching earrings was designed by Larry Vrba while he worked for the company in the early 1970's. He was inspired by pre-Columbian Aztec and native American motifs and this inspiration is especially prevalent in his designs for Castlecliff. This brooch features a large, central turquoise-colored glass stone; the same stones are featured in the accompanying earrings which are hard to find and rare. In fact this may be the only pair I have ever seen. The central stones were made from melted glass beads which were produced by the bead company named "Jewelry of Four Seasons" which Castlecliff owned for about 5 years. Diameter is 2 1/4 inches on the brooch; the earrings are just shy of 1 inch wide. Brooch is signed CASTLECLIFF on a rectangle; the earrings are signed on the screw back mechanism; hard to see but it is there. This is a book set, featured on page 239 of "Classic American Costume Jewelry, Vol. 2" by Jacqueline Rehmann. I can include a copy of the book reference if you like.