Spirit amulet

Once a dwarven child is born, their mother carves a spirit amulet out of wood, and gives it to the child. Once the child turns 10 they carve a replica of that amulet out of bone as part of a celebration that they survived the hardest years, and return the wooden amulet to their mother. If they die before the age of 10, the amulet is returned to the mother after the charring ceremony. As they reach 20 years of age, they carve a new amulet out of Ivory during a coming-of-age ceremony. The bone amulet is then given to the mother and replaces their wooden amulet. Dwarves often spend a lot of time practising carving amulets as the piece is closely related to their pride. At this ceremony, they can choose a spirit-bond with another dwarf. They then both carve an element of the other's amulet into their own to signify the bond. If one bonded dwarf dies and the other lives, their personal spirit amulet is given to their spirit-bond. If one dwarf dies that has no living spirit-bond, their amulet(s) are given to the clan's spirit guardian.
You can tell quite a few things about the amulets someone is wearing: If they have wooden or bone amulets next to their own ivory one, they have children. If one or more of those is charred, that means they have lost a child. If someone is wearing two ivory amulets, their spirit-bond has died. If their personal amulet is heavily charred, they have lost many people of their clan.