nature.berkeley.edu/classes/eps2/wisc/Lect3.html Gems nature.berkeley.edu berkeley.edu Material 'Where do gems form?' Where Do Gems Form & Where Are They Found? http://nature.berkeley.edu/classes/eps2//wisc/Lect3.html https://nature.berkeley.edu/classes/eps2/wisc/Lect3.html Where do Gems form? & Where are they found? Where Do Gems Form & Where Are They Found? https://nature.berkeley.edu/classes/eps2/wisc/Lect3.html