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The whole thing is made of hot glue...
Spread out your foil. If you're using white glue stick then you better crunch the foil or else it's not necessary. Using the crunched foil and the white glue sticks can give nice effect.
Draw something out of the hot glue and let it cool. You can also paint it with nail polish.
Take a ring base place it on foil and line the ring with hot glue, let it cool and take it off. Do the same thing for the back side. Repeat if you like the ring to be thick.
Glue it on your hot glue charm.
BE HAPPY :D