Replica communicator badge from ST: TNG. Design is two part so you can print with metallic gold and sliver filament and skip the painting. On the back are holes for 3x6mm neodymium magnets (see link below). Just print and superglue it all together.
The picture shows how it comes out if you print the silver part flat. If you don't like the circles, you can print it vertically or diagonally instead. You'll need supports for a clean print either way.
I would definitely recommend printing at 0.10mm layer height or thinner to maximize the smoothness of the curvature. Image shows 0.10.
V2: The silver part is now a little bit thicker to make it stronger when separating from the supports.