This is a gorgeous brooch in the style of the Schreiner "spoke pin" design featured on page 60 of "Schreiner: Masters of Twentieth-Century Jewelry" by Carole Tanenbaum and Eve Townsend.
It's absolutely gorgeous with rhinestones in shades of deep purple, citrine and orange, and looks incredible when it catches the light.
PLEASE NOTE: The design clearly appears to be Schreiner but there are a few things about this particular brooch that I want to point out that are slightly different than the one in the book:
The middle purple stone has six prongs rather than four, as shown on the one in the book.
It does not have a pendant loop to wear as a necklace.
The outer layer is hooked to the middle of the brooch securely but it's slightly different than the hook and eye construction that Schreiner often used in the center of the brooch.
It is not signed Schreiner but is signed Sterling in a cartouche. Schreiner rarely made brooches in Sterling.
Despite all of these variations, the brooch is clearly the spoke pin design and likely one of Schreiner's unsigned pieces.
It is in good to very good, wearable condition with light age-related wear to the surface, including light wear/scuffing/spotting on some of the rhinestones and a small chip on one of the round citrine colored rhinestones that is noticeable with a loupe but hard to detect otherwise.
It's truly a stunning and large hard-to-find statement piece that measures 3 inches at its widest point and just over 3 inches high.