Show GEMS DYED WITH RADIUM artificial color can be given to precious stones stone by use of the costly metal with chloride and bromide of 0 radium at a milligram or a grain the us use e of radium to give eire artificial color to precious stones has little industrial promise to give a more accurate idea of the possible chances chang cs armbrecht in london has been experimenting for many months and has produced some remarkable effects upon color about nalto bite sapphires sapp hires pure oxide of aluminum were kept in contact radium two or three weeks about 70 per cent turned yellow the shades ranging from lemon to dark orange a few apparently parent ly from another locality became green pinkish or amethyst color and a very few changed to rose color A light blue was imparted to two or three too light to give value approaching pro aching that of the much prized deep blue sapphires sapp hires pale emeralds were somewhat darkened by radium but were not given the deep green of the expensive stones B brown rown diamonds were bleached almost white nothing being obtained like ike the beautiful blue gem into which sir win crooks transformed a yellow diamond amethysts were altered by radium into smoky or yellow quartz dirty appearing pearls were cleaned to a clearer white but opals were not amenable I 1 to 0 treatment |