Ivory is expensive mainly because its supply is very limited, coming from elephant tusks only. And prized for its close-grained texture, adhesive hardness, mellow color, and pleasing smoothness. It may be painted or bleached and is an excellent material for carving.
Can be removed tusks without killing the elephant?
It can, but would be painful. There is a nerve that runs well down the length of an elephant’s tusk. Cutting the tusk off would be painful, similar to you breaking a tooth.
But poachers use darts, poison and high-powered automatic rifles with night scopes to take elephants down and, while they are dying, the tusks are gouged out of from the living elephant’s skull.