Diamond gemstones were very well appreciated in the antique world.
Independent on the purpose of jewelry, diamond is a crystalline solid
state material with excellent physical and chemical properties as a high
Young modulus or a very high thermal conductivity. By doping the
material with boron, electrical conductivity can be observed. This is
important for electronic devices. In this talk the wide range of production
of gemstones and technical applications like high frequency
high power microwave transmission diamond windows for nuclear fusion
power plants will be presented. Different diamond classifications,
cuts and colors by impurities will be shown. A comparison of natural
diamonds and artificial produces ones are topic of the discussion
