London-listed diamond miner Petra Diamonds has reported a 7% year-on-year reduction in production, from 3.87-million carats in the 2019 financial year, to 3.59-million carats in the financial year ended June 30, 2020.

Production was severely disrupted by the lockdown implemented in South Africa from March 26, while the Williamson mine, in Tanzania, had been placed on care and maintenance in April.