Metallic Chocolate Circles

Flashy. Earthy. Mineral-like. These shiny baubles will add elegance to any cake.
Supplies:
(1) iced cake
4-6 oz. white chocolate
Icing knife
Palette knife
Food grade paintbrush
Gold, Silver, Bronze luster dust
Circle cutters in different sizes
Vodka
Silpat mat or parchment paper
Microwave safe bowl
(2) small bowls