Therefore the Pomona area was the only place to set up new claims .
After extensive legal struggle official diamond mining started in 1912 under the auspices of the Pomona Diamanten Gesellschaft ( Pomona Diamond Corporation ) .
Therefore the Pomona area was the only place to set up new claims , and after extensive legal struggle official diamond mining started in 1912 under the auspices of the Pomona Diamanten Gesellschaft ( Pomona Diamond Corporation ) .