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 Army also given the opportunity to purchase the T-shirts before home games. Only students are given official Garnet Army T-shirts. In January 2011 Garnet and Black Traditions began selling "Garnet Army Reserves" shirts to the public. Other gear that has become custom for the Garnet Army includes: Garnet combat helmets, garnet army hats, army combat boots, garnet & black camo body paint. Another tradition developed by Coach Horn, was initiated in 2009 to indoctrinate the students into a unified and intimidating force. At the Garnet Army Boot Camp, students were able to interact with players and coaches, and gather knowledge on