Handmade solid silver and gold World necklace

I made this solid silver necklace with PMC clay. The clay is formed and dried, filed and then fired. The result is .999 silver. More silver than you get in .925. The gold is 24 karat that has been applied in the Kombu method with heat, and is completely permanent. The length of the chain is 18 inches and the world medallion is 1 inch. The chain is sterling silver, with a lobster claw clasp.