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
Thomas Garnet Thomas Garnet Saint Thomas Garnet (c.1575 – 23 June 1608) was a Jesuit priest who was executed in London. He is the protomartyr (i.e., the first martyr associated with a place) of Saint Omer and therefore of Stonyhurst College. He was executed at Tyburn and is one of the Forty Martyrs of England and Wales. Thomas Garnet was born into a prominent family in Southwark. His uncle, Henry Garnet, was the superior of the Jesuits in England. Richard Garnet, Thomas's father, was at Balliol College, Oxford, at the time when great severity began to be used against Catholics. His example