Pinchbeck was invented by Christopher Pinchbeck, a London clockmaker, in the late 18th century. It is a combination of copper and zinc that is very durable and resembles gold. As an affordable substitute for gold, many people would travel with jewelry made of Pinchbeck instead of gold for fear of being robbed en route to their destination. Popularity declined in the mid 19th century due to the legalization of nine karat gold. Authentic Pinchbeck is highly desirable and collectible.