Prices of major rare earth metals have been steadily climbing since China hinted at weaponizing the materials in the US-China trade war, suggests data collected by Asian Metal. Dysprosium is up 14 percent since 20 May, when Chinese president Xi Jinping visited a rare earth mine. Neodymium is up nearly 14 percent since then. Both elements are used to manufacture strong magnets, among other things. Prices of europium, terbium and yttrium, which are primarily used in lighting applications, have been relatively stable during the same period.