What is the significance of the keystone state charm and the charm bracelet itself in the The Lovely Bones?

In
, one of the critical pieces of evidence left behind after Susie is murdered
the keystone state charm. The charm itself is representative of Suzie because it bears her
initials. It was a gift from her mother and is unique to her because they do not live in
Pennsylvania. The keystone charm was the only charm that Mr. Harvey takes off of the bracelet in
chapter 4 because it has Suzie's initials on it, and he keeps it as a souvenir.

The bracelet is distinct and recognizable, and so Mr. Harvey throws the rest of it into
the place that will eventually be a lake. He doesnt remember taking the bracelet and only finds
it in his pocket after he dumped Suzies body down the sinkhole.

The keystone
charm is symbolic of Suzies place in the family. The keystone goes in the center of an arch and
stabilizes it so that it can stand. Suzie, the middle child, ended up being the keystone of her
own family who suffers and...