Every stone is specific to that being., and cannot be dictated by the “birthstone chart” at JCPenny.
More importantly the stone that you are drawn to when you're thinking of that person, is more than likely exactly what that person needs in order to balance their energy [creates healing].
This is the taproot of the “lucky charm” , origin story quality often associated with amulets or stones. It Literally makes you feel better upon site.
When you feel better, you do better & draw better things to you. [ basic law of attraction ] Translated, and watered down over the years into simple “ luck”