1. mammoth ivory is an ancient ivory, which is rare and precious. It is often used to make handicrafts and jewelry.

2. Pig teeth are pig teeth, which are generally used for handicrafts and decorations.

3. Mammoth tooth bracelet is solid and delicate in texture, soft in color and smooth as jade. The price of first-class mammoths is higher than that of modern ones. Tooth carvings are exquisite, gorgeous, durable and precious, and are known as "organic gems".

4. The texture of the pig's tooth bracelet is hard, smooth and moist, but the density of the pig's tooth bracelet is poor, with a few brown spots near the pulp and many gaps in the pig's tooth groove.