1, the nebula Tianzhu was polished by Tibetan conch fossils. Later, due to the scarcity of fossils, Tibetans began to polish Tianzhu with a sedimentary rock containing jade and agate, mainly produced in the Himalayas.
2. The dzi beads produced in Taiwan Province Province, that is, Taiwan Province beads, are all made of silk agate, which are different from each other.