Nothing very special about this pin, looks to be 1930's/40's made to resemble the glass fruit salad jewelry by Trifari, etc.
The pastel insets are plastic, the enamel is cold painted.
I'm curious about the testure on the back, look to be snowflakes, all in pot metal.
Anybody seen this texture before, maybe a Czech piece ?
That's a really cool bit of artistry. Czech might be a good guess. I'll have to keep thinking - it reminds me of something.
Thank you Kay. 
I thought it was interesting enough to bring home and study. I will probably throw it in a lot at some point but I really just brought it home for the education.
Hopefully someone has seen this texture before.
Hi Cali. I have a potmetal brooch with this same texture on the back with the same hard plastic stones and cold paint enamel work.
I have always thought it might be New England Glass Works Company, but have never been able to prove it. Maybe someone here can help with an ID. I think the pieces and texture are unique enough that they are identifiable.
Oh wow, very cool Sandy ! Thanks for posting a cousin to mine. 
What interests me about these pieces is that it's not an all-over texture such as 1928 or some of the others, but a carefully applied design exactly corresponding to the placement of the stones. I would think this would be done by a top-notch manufacturer
