How a Pendant rests on the chest

Hi, Ever wonder why a lot of fine jewelry bails are sort of
triagularly-shaped when viewed from the front? How about those
bails that are attached to tubing sections where the tubing then
slides on the chain/cord?

These are two ways that people try to keep the pendants facing
forward. The idea is that the more strongly the pendant is forced
to follow the chain, the more likely it will stay facing forward.
It works quite well on shorter-length chains (but you weren’t having
problems with that…); it works on long chains so long as the chain
itself doesn’t twist and turn the pendant over.