Before answering the question, let's be clear. The Golden Soul of the Saint is an animation co-produced by Dongying Animation and Bandai (a large toy company), without any comic book foundation.
1, this necklace is Sagittarius. I gave it to Athena as a child and later to Leo.
2. This necklace has no name, but it is only used as a prop for Athena's karma to lead to Leo's golden garments.
I didn't buy it online.
4, not every constellation, this is Sagittarius's personal belongings.