Talk:Ruby Rose/@comment-12.27.66.8-20150617211837/@comment-24891101-20150618052954

Same mineral (corundum), same crystal structure (trigonal, 3 2/m ). Different trace impurities (chromium in the case of ruby) lead to different optical properties, with minimal effect on material properties or parting. Literally the only difference between the two is optical.

A cursory Google search on this topic has all sources in agreement. Both the ICA and GIA agree with me.

Try again.