This could be for a bestie or for a lover, there are companies that sell things to make blood vial necklaces so you and your chosen loved one can wear each otherās blood.
There are also other companies that will turn weird things (hair, lost tooth, scraps and ephemera that are sentimental, ā¦other bodily fluids, etc.) into jewelry/ pendants for you to give as gifts or keep as tokens. There are quite a few out there. Maybe start by looking on Etsy or Instagram for some small businesses!