Inspector Andre Traut said a 50-year-old inspector was arrested on Thursday and a 45-year-old inspector was arrested on Wednesday night.
Both were affiliated to the Kuilsrivier police station.
"The men duped a man who was selling his car. They posed as potential buyers and then allegedly planted fake diamonds in the car.
"When the seller left with his vehicle, they followed him and asked him to pay money to avoid prosecution," said Traut.
The officers then accompanied the man to collect the money.
"Corruption within our ranks will not be tolerated, and every endeavour will be made to root out these phenomena," he said.
The two men were due in the Cape Town Magistrate's Court on
Monday.
Sapa
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