There are many products and ways to achieve a metallic lip. I like to create mine. Here is an easy way.
Mix a pigment and a clear gloss onto a clean stainless steel palette with a stainless steel spatula and apply it on your lip with a lip brush.
Products shown on picture: MAC Stone Lip Pencil, Anastasia Sepia Liquid Lipstick, MAC Rose Gold Pigment mixed with MAC Clear Lipglass, MAC gold glitter sprayed with MAC Fix + on my top lip.