This is Vintage Sterling Silver Gold Overlay Clip On Helmut Shell Earrings & Brooch. The pendant / brooch measures 1 1/2" long and 7/8" wide, it is 800 silver.
The earrings measures 5/8" long and 1/2" wide, they are sterling silver with gold overlay. They weigh 9.8 grams.They are marked 800 and other marks. They are in very good condition and would make a wonderful addition to your collection!