The pendants each have a different design on them that resembles the different Garde members.
They glow when their placed on a Loric's heart, the faster the heartbeat, the brighter the glow, their also believed to to be connected to the Loric Charm as Number Six felt her pendant throb when she would be dying of starvation and dehydration.
It is revealed that the pendants are the key to rebuilding Lorien.
The pendants were first seen at the beginning of the film when the Mogadorians take Three's pendant from Three's corpse in Africa. Four's pendant was seen in the beginning of the film when he swam in the ocean. Throughout the film, Four's pendant was worn around Four's neck but hidden by his clothing.
- In The Revenge of Seven, it is revealed that the pendants are the key to rebuilding Lorien.