This gold-plated sterling Coro brooch is delicately enameled, with clear rhinestone accents. Superb condition!
Measurements: Just under 2 inches by 1.4 inches (5 by 3.6 cm)
Marks: Sterling Craft and Coro (in script) in rectangular cartouche
References: The 1942 patent issued to Adolph Katz is attached. A triquette version appears in Brunialti, “American Costume Jewelry”, page 129.