This instructable shows how to make the earrings via 3D print, but if you skip ahead a few steps and buy or make some real gauges, you should be able to make faux gauges without the 3D print component. 3D printing seemed good to me because I could make sure both sides were identical!
Printing was done at TechShop!
Step 1: Design Earrings
I also played around with Sculpey clay beforehand to work out what shape I wanted to make- you might want to try it out.