Yttrium aluminium garnet (Ce:YAG) is used as a phosphor in cathode ray tubes and white light-emitting diodes, and as a scintillator. YAG for a period was used in jewelry as a diamond and other gemstone simulant. Colored variants and their doping elements include: green (chromium), blue (cobalt), red (manganese), yellow (titanium), purple (neodymium), pink, and orange. As faceted gems they are valued (as synthetics) for their clarity, durability, high refractive index and dispersion. The critical angle of YAG is 33 degrees. YAG cuts like natural garnet, with polishing being performed with alumina or diamond (50,000 or 100,000 grit) on common polishing laps. YAG
Garnet Hughes and was eventually given command of the newly formed 5th Canadian Division, but it was an administrative post only, since the 5th Division was broken up as soon as it reached England. Its men were sent as reinforcements to replace battle losses in the four other divisions of the Canadian Corps. The 5th Division adopted a coloured formation patch identical in design to that worn by the four combatant divisions of the Canadian Corps. The colour selected for the patch was garnet, in recognition of Hughes' command of the division. With the resignation from the Canadian cabinet of his father