A sûreté is a stick pin with a fixed ornament on one end and a detachable ornament on the other. It came in use around 1920. Also referred to as a jabot pin.
Alternately defined as any pin or tie pin with a safety device designed to attach to the pointed end, either screwed or clipped on mechanically, to prevent loss.
Art Deco Sapphire and Diamond Sûreté or Jabot Pin.