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Fekete Gyemantok is based on a novel by Maurice Jokal. The title translates as Black Diamonds, a reference to the Hungarian coal-mining community where the story takes place. Amidst political, economic and labor-relations intrigue, a triangular romance develops involving Ivan (Paul Javor), Evila (Zita Szeleczky) and Felix (Eugene Torzs). Since Felix is the villain of the peace, the outcome of the "love stuff" is predetermined from the start. Director Ladislao Vajda does wonders with an obviously tight budget, especially during the elaborate stock-exchange sequences.