Here are the first pendants that I have cast my self. Truely one of a kind because I'm just starting to mess with casting and don't have a clue how I got those colors.
I cast the blanks in of all things a muffin pan. It is polyester acylic you can buy at Michaels or Hobby lobby. The color comes from a powder pigment call pearl-ex. I bought a fixture made to do these. Here is a video on how to do these.