Homeward BoundRare Copco Agate finely crafted cabochon in a fine and sterling silver bezel setting with sterling silver wire bound noodle bail. This amazing cabochon looks like a cow in tall meadow grasses. 18" sterling silver Omega chainCopco Agate is from far Northern California. It is found near a reservoir owned by the California Oregon Power Company, thus the name COPCO. This material looks a lot like Montana agate only it's more opaque.