Here's a little project you can work on at home!
As you can see from the pictures this will become a light up necklace that glows from the back.
First, print the front and back.
Use the back part to create a copy in clear resin so the light can travel though it and escape.
Get an LED necklace and cut off whatever shape was there normally.
Glue the clear back and the silver front together.
Create the center piece with some air hardening clay and glue it in the center. Paint it red (or the color of your choice).
Glue the necklace part to the resin part, and you're done.