Found this video on Polymer Clay Daily.
Now, one thing she doesn’t say is that molds, especially intricate ones, are kind of a pain, so don’t be surprised if it takes a few tries. Also, I’d be moving that piece from the mold directly to the tile I’m baking it on, so I don’t have to move it after I’ve cut off any extra bits.
This video led me to Hilla’s Etsy shop, and her blog, which I immediately subscribed to. I especially love these necklaces, though I’d be inclined to make them with fabric. Neat ideas that anyone can execute with some practice.