I've shown a design idea in the last photo.
Cast metal findings, made in Mykonos Greece. Mykonos Castings start with a lead-free base metal, but are then coated with copper and finished (in the same way their Metalized Ceramics are finished) with fine metals (pure copper, fine silver and 24k gold).
SIZE: 29 mm (1.14 inch)
COLOR: copper/green patina
MADE IN: Mykonos, Greece
To see more Mykonos Green Patina: http://www.etsy.com/shop/FabBeads/search?search_query=green+patina&order=date_desc&view_type=list&ref=shop_search