Myanmar is the world's leading producer of jade. Up to 90 percent of global supply of the precious stone is mined in the country's northern Kachin state, despite a decades-long armed rebellion raging there. According to the NGO Global Witness, some 90 percent of this jade is then smuggled out of the country – almost all of it to neighbouring China. Once favoured by emperors to defy death, jade and its knock-offs continue to be worn as a status symbol. Our correspondents Yena Lee, Yorben den Hartog and Jasmine Ling report.