The necklace is made of plastic shrink i is very easy to do you can see below sorry if the explanation is not very good and I translate all because I'm from Spain;)
You need shrink plastic that I really bought it on Ebay sure is already there in Valencia
cutting a piece of shrink plastic plates and with a fine file lijais such as nails.
smoothed by the drawing sheet with permanent marker drawing that querrais do.
by the square top of a hole do you do with a stapler you have at home.
In the end I bake with acrylic paint and paint it on the gloss.
Just need to put a pendant on a chain and put ready;).