We have 3 Stick Pins / hat pins vintage.  They have metal pins (2 in a copper tone, 1 in a tarnished gold) and are missing the end pieces if there ever were any.  The tops could be celluloid surrounding the rhinestones.  They measure about 2 1/4" in L x about  3/8" across the widest point being the center of the rhinestone.  The metal is a bit tarnished on the pins.  

3 Stick / hat Pins Vintage