These pins are handmade from Dichroic Glass fused in a kiln onto black glass. You can see on the last photo how there were constructed differently and how the pin backs are attached.  They are a creation of CMS (Charity Stone's) Studio.  The price is for two pins.  Pins  are about 2 1/2" across.  

(Remember that since these pins are made of glass, they are breakable, so keep this in mind if you are purchasing them for a child).