Jules Verne: Star of the South

A story from the South African diamond fields, centred on the "Star of the South", a diamond of unprecedented size and beauty. The French engineer Cyprian Méré is convinced that he managed to produce it by an artificial process he invented. He filled the metal casing with a chemical mixture of his own making, sealed it and annealed it in an oven for two weeks. Then the case exploded and Méré found the diamond in the shattered case under a layer of clay. However, the diamond mysteriously disappears during the reception. An older version from 1965 in the Czech Budejovice radio studio.