Yellow gold filled, base metal is 925 sterling silver. The choker can be used with other pendant too and the coral pendant can go with other chains as well. Very thoughtful design. The price is only for the coral necklace choker in the pic.
REAL AMBER is between 30 - 90 million years old. Copal is not Amber. Copal is the immature resin of a tree, being only a few hundred years old to a several thousand years old. Amber is the mature fossilized resin of an extinct tree and is millions of years old.