Add-On necklaces, which located in Piercing category can be worn separately, as well as together. You can combine all necklaces in the set, or wear just two, three, etc. and mix them how you want. 

These necklaces have following categories:
Tennis Necklace - Nose Left
Row Two Necklace - Nose Righ
Row Three Necklace - Lip Left
Row Four Necklace - Lip Right
Pendant Necklace - Brow Right