The establishment of the festival was initiated by President VÃ¡clav Havel, who opened Prague Castle to artists at the beginning of the 1990s in order to attract the public. The first performance of Shakespeare took place here in 1990 and the festival has been held here regularly since 1998.
1 A black dwarf is a white dwarf that has cooled sufficiently such that it no longer emits any visible light. 2  A brown dwarf is a substellar object not massive enough to ever fuse hydrogen into helium, but still massive enough to fuse deuterium âless than about 0.08 solar masses and more than about 13 Jupiter masses.
The black diamond is a diamond. It is a real diamond. There is more to them of course than that. Some notable black diamonds are the Black Star of Africa at 202.00 cts. and the Black Orfloff, at 67.50 cts. A natural black diamondâs color is caused by the presence of numerous inclusions, often consisting of graphite. Due to the dense concentrations of these dark inclusions, sometimes lining cleavages and fractures, black diamonds are generally opaque.