Might be a human made into a stone.
How to Turn Cremation Ashes Into Crystal Keepsakes
https://www.joincake.com/blog/turning-ashes-into-crystals/
-
Rings
Inserting a cremation crystal into a ring is another popular option. You could insert the crystal directly into the band itself, or you could use a ring mount.
Either way, the result is a small but meaningful piece of jewelry you can wear whenever you please. Some prefer this option over a necklace, as there are some occasions and situations when wearing a necklace isn’t practical.