four-leaf jade egg ring, Golden;silver

jadeite belongs to the pyroxene group, mainly composed of sodium aluminosilicate (naalsi2o6, gemstone contains more than 50% of sodium aluminosilicate is considered as jadeite), which is produced in metamorphic rocks generated under low temperature and high pressure. often associated with bluetongue, muscovite, hard-stigma (dihydrate calcium feldspar), aragonite and quartz. mohs hardness is between 6.5 -- 7, specific gravity is between 3.25 -- 3.35, melting point is between 900 -- 1000°c.