Butterfly wings are used in a picture and then encased in Glass/Plastic .
The wings give the picture a beautiful Blue, green Purple iridescent color.
Usually a background for a Tropic scenes such as Rio with Palm Trees
The Base is usually sterling Silver.

VINTAGE BUTTERFLY MARCASITE BLUE WINGS (2 )
US $25.00 (0 Bid) End Date: Tuesday Mar-16-2010 [...]

Coro jumped on the Copper Jewelry bandwagon briefly during the 1950’s.
I own one copper necklace by Coro.
Vintage Copper Jewelry would not be complete without a entry by Coro.
Coro  saw how popular Copper Jewelry by Matisse & Renoir was & decided to jump on the bandwagon in the 1950’s.
Coro made of Copper Jewelry  for a short [...]