One of the key props in the film is a diamond necklace. Because of
Robert Aldrich's insistence on accuracy, this was a real diamond necklace, that came complete with a special female courier, disguised as a secretary, and with an escort of guards on the set. Special arrangements were made with the local bank and sheriff's department in the location of Placerville, California, while the necklace itself was transported by a motorcade of vehicles.
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