About Jigme Lingpa:
Jigme Lingpa was a tertön of the Nyingma sect of Tibetan Buddhism. He was the promulgator of the Longchen Nyingthik, the Heart Essence teachings of Longchenpa, from whom, according to tradition, he received a vision in which the teachings were revealed. The Longchen Nyingthik eventually became the most famous and widely practiced cycle of Dzogchen teachings. Namkha'i and Shane (1999: p. 135) affirm that Jigme Lingpa wrote a treatise on the spiritual and medicinal usage of crystals and gems of principal importance.