There is a rite in esoteric Buddhism (mikkyō) involving the creation of wish-fulfilling jewels (Skt. cintāmaṇi; J. hōju) by enshrining relics within a sphere of powdered incense and lacquer kneaded together. The sacred gems created through this practice are called “Nōsashō Jewels,” and they were in turn used in the Hōju Rite, an esoteric Buddhist sādhanā performed with the wish-fulfilling jewel as its principal object of worship (honzon). Inserted inside this wishfulfilling Nōsashō jewel are a container thought to be made of crystal and a relic.
 
NAITO SakaeEnglish by Mary Lewine 
Buddhist Art Paradise: Jewels of the Nara National Museum. Nara National Museum, 2021.7, p.341, no.114.