Safety Catch
safe·ty catch | ˈsāf-tē kach
noun
A method of securing a brooch to a garment with a swiveling that locks the tip of the pin stem into the C catch
A safety catch is a device attached to a brooch designed to secure it to the garment worn by the wearer of the piece of jewelry. The safety catch has a swiveling head that locks down to keep the tip of the pin stem in the C catch. After safety catches were invented, they changed how brooches were attached. Prior to their use, the most common way to attach a brooch to a garment was with a simple C catch that had no locking mechanism, meaning it was easy for a piece to fall loose even without being jarred or bumped. Similar types of clasps are used for other jewelry depending on how it is attached and to what material.