ED-XRF analytical graphical representation of chemical composition in 2 different rubies (conditions 50KV, aluminum filter, 200 seconds measuring time) (A) In green result of chemical analysis of a lead-glass treated ruby from Madagascar. Note traces of Cr, Fe, Ga and Pb and (B)in red the result of ED-XRF analysis of a Bi-glass treated pink sapphire from Vietnam. Note traces of Cr, low Fe, Ga and Bi. Lighter elements are not measured at this experimental set up.