What is the origin of the wonderful jade in A Dream of Red Mansions?

Miaoyu, one of the twelve women in Jinling in A Dream of Red Mansions, is a nun who has made great efforts to practice. Once a young lady of an official family, she became a nun in Pan Xiang of Xuanmu Temple since childhood. Jiafu built the Grand View Garden, and Miaoyu stayed in the Jade Hall. In front of the grandmother and Mrs. Wang, she is calm and supercilious; During her stay in the Grand View Garden, she forged friendship with Baoyu, Daiyu, Baochai, Xiangyun, Xichun and Xing Xiuyan. She is beautiful, intelligent and noble-minded, but she is hated by others, which is unbearable for the world; She is a Buddhist disciple, but she loves Zhuangzi greatly in literature, and her feelings are unclean and empty; She is brilliant and tasteful. She tasted tea in Cuian, portrayed her exquisite tea art, wrote poems on the Mid-Autumn Festival night, and portrayed her as a "fairy in a red chamber". Baoyu lost his psychic Baoyu and asked Miaoyu to help her. Grandmother Jia was critically ill, and Miaoyu came to visit the sick uninvited. On the second day after the funeral of Grandmother Jia, Miaoyu was robbed by thieves, and Baoyu sighed sadly. Later, it was rumoured in Jiafu that she was killed at the seaside.