We have a Teacher Brooch nos Russ Vintage item.  It has been in storage since the late 1990's.  It has a pin back with the front having an apple with  a silver tone metal chain hanging with rhinestone covered A+.   From the top of the apple to the bottom of the A+ it measures about 2 3/4" in L x about 1 1/8" across the widest point on the apple. It is nos in the original package, in nice condition.