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Precious Stone (Baoshi): Primarily treats the removal of corneal opacity (Yi) and brightens the eyes; used in eye drops. If dust enters the eye, wiping it with a precious stone bead removes it immediately (*Bencao Gangmu*). [Names] (Li Shizhen states): Red ones are named Cizi; greenish-blue ones are named Dianzi; emerald-green ones are named Majiazhu; yellow ones are named Munanzhu; purple ones are named Lazhi. There are also Yahu Shi, Maojing Shi, Shiliuzi, and Hongbiandou. [Origin]: Produced in the pits and wells of Xifan Huihu regions; also found in Yunnan and Liaodong. (*Shanhaijing* states): Guo Mountain has much jade; Qi River flows from there westward into the sea, abundant in Caishi, which is Precious Stone. Greenish-blue stones were called Sese by Tang people; red ones were called [missing character] by Song people; now generally referred to as Baoshi, used for inlaying jewelry and vessels. (Zhang Bo's *Wu Lu* states): Bibe pearls are produced in Yuejun, Yunnan, and Hezhong, obtained only after sacrifices; varieties include Piao Bi, Lv Bi, and Shen Bi, which are greenish-blue precious stones. [Quality]: Large ones are finger-sized, small ones... Non-toxic.

Water Crystal (Shuijing): Primarily treats warming the eyes to eliminate hot tears (*Bencao Shiyi*); also used in eye drops. Swallowed while threaded, it can push out various foreign bodies causing choking (*Bencao Gangmu*). [Names]: Water Crystal, Shuiyu, Shuangying. (Li Shizhen states): Crystalline and transparent like the essence of water, named by meaning. (*Shanhaijing*) calls it Shuiyu; *Guangya* calls it Shuangying. [Origin]: Wa country produces the best Water Crystal. Southern Water Crystal is white; Northern Water Crystal is black; those from Xinzhou and Wuchang are turbid. [Quality]: Hard yet brittle, cannot be scratched by a knife. Color is clear as spring water, bright and lustrous; if placed in water without flaws it becomes invisible, such pearls are superior. [Color]: Black, white, cyan, and purple. (*Leishu* states): In the 4th year of Taikang, Fan Neng, King of Linyi, presented one purple Water Crystal spittoon and two cyan-white Water Crystal spitoons. [Taste]: Acrid (Xin). [Nature]: Cold. [Counterfeits] (Ancient saying): The notion that ice transforms into this is false. Medicinal substances fired into glass have air bubbles and are called Xiaozi, also known as Haishuijing. (*Baopuzi* states): People in Jiaozhou and Guangzhou make fake Water Crystal, likely referring to this. Fire Pearl (Appendix to *Gangmu*) (Li Shizhen states): *Shuowen Jiezi* calls it Huoqi Zhu; *Han Shu* calls it Meigui (pronounced Mei Hui). (*Tang Shu* states): In the southeast sea lies the Kingdom of Luocha, producing Huoqi Zhu, large as chicken eggs, round and white like Water Crystal, illuminating several feet; at noon, moxa held beneath catches fire; used for moxibustion, the moxa cone does not harm the skin. Currently, the Kingdom of Champa has a variety named Zhaoxia Dahuo Zhu. (Also according to *Houxuhan Shu*): The Ailao Yi produce Huojing. Liuli is an error for Huoqi/Huojing, standing opposite to Water Crystal. Shi (sound [missing]) (Appendix to *Gangmu*) (Li Shizhen states): Produced in Yanmen, inferior to jade, white as ice, some are red. (*Shanhaijing* states): North Mountain has much [missing] Shi.