Gift from...Grandma?

Jon opened the package—which didn't have a return address—to find a box. It was almost identical to the one that the stone came in except its color was lighter. He slowly opened the box to find a piece of paper folded into sixths that said "To Jon, From Grandma" and, under it, a stone almost identical to the wishing stone except it was pink. ...Wait, Grand...ma? He unfolded the piece of paper to read the letter.