Vintage Duet Style Art Deco Elegant Silver and Blue Brooch

This elegant brooch features a stunning combination of silver and blue, perfect for adding a touch of sophistication to any outfit. Its intricate design makes it a standout piece in any jewelry collection. One side is missing a sapphire The image shows the back of a vintage "duette" style brooch, which is a type of convertible jewelry that can be worn as a single brooch or separated into two individual dress clips. The text "PAT. 1852188" refers to a patent for this type of jewelry mechanism, which was granted to E.A. Phinney for Island circa 1931. The "duette" design was popularized by the brand Coro in the 1930s, although other companies like Trifari also created similar "Clip-Mates". The mechanism on the back allows the two clips to be attached to a frame to form a single pin or brooch. The term "duette clip" is now often used as a generic term for these types of convertible pieces, regardless of the brand.