I hesitate to make jewelry jealous, but I have a second love, and that is woodworking. While metal is lustrous and luminous, wood can contain chatoyance beyond my wildest dreams. It is a transformative thing to move between metal and wood.
Cuttlefish bone casting is an ancient technique that involves pouring molten metal directly into the carved bone. Sand casting is also very historic: it is the process of pouring metal into a carved cavity of sand.