These Vintage Floral Stones have a hole in the flat  back that will allow them to be used as Hat Pins. (The Topaz stone has a "nub" in the back to take the pin.   Each piece measures 40mm and is 5mm thick.  They have a very detailed raised floral design with matte petals.   I've had these set in sterling and they made beautiful pendants.  Each lot consists of one of these beauties in any of the following colors: Aqua, Cobalt, Topaz and Amethyst.