After lots of Divergent Inspired Jewelry, which has became very popular with the jewelry makers/designers, this may have to be one of my favourites, I’d presume, although there are a lot more we all haven’t seen!
These are delicately made by Sawyer & Scout, with the name of each faction on one side and Divergent on other, taken from the book.
Source: http://www.sawyerandscout.com/product/divergent-inspired-faction-necklace