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 Valley, Pennsylvania the zip code "city names" are often confused with actual municipal names. As of July 1, 2009, Garnet Valley was removed from zip code 19061 and assigned to a new zip code, 19060. Although the community name is derived from the Garnet Valley School District, the district's headquarters are not within the Garnet Valley ZIP code. The district's address is in Glen Mills, Pennsylvania 19342. The community name is derived from the Garnet mines established in Bethel Township by Herman Behr & Co. of New York in 1879. The mine operated until 1912. Garnet Valley, Pennsylvania Garnet Valley is an