Swoboda jewelry was founded in 1956 by Edward Swoboda, who worked out of Los Angeles. He retired from the company in 1979 and his partner Nate Waxman ran it until it closed in 1985. Swoboda is known for its costume jewelry made with real semi-precious stones.
Before 1966 they used only hand tags, so this particular piece is post 1966, with a signature in the cast.
It is currently on sale at Circle & Square boutique in San Francisco.