TRADING UPDATES: Petra prices recover; Zoo Digital earnings to jump Tue, 20th Apr 2021 18:36 (Alliance News) - The following is a round-up of updates by London-listed companies, issued on Tuesday and not separately reported by Alliance News: Petra Diamonds Ltd - diamond miner - Reports third quarter revenue of USD106.0 million, up 16% on a year ago as prices recovered to pre-virus levels. Third quarter production 704,498 carats, down from 932,456 carats year-on-year, with group's quarterly revenue increase driven by improved pricing. On a like-for-like basis, realised diamond prices increased...