Answer:
Split me in half, and you get me and another me. What word am I?
What has fingers and a thumb but no hand?
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
It is a gruesome form of betray.
Mostly worn by women or girls, this is sometimes shiny like silver or gold, and sometimes it is made of pearls.
People take me on walks and I run and have fun. What am I?