BUZZ-Petra Diamonds: hits 14-mth high on Q1 production
** Petra Diamonds (Frankfurt: 908093 - news) up about 8 pct at its highest level since Aug 2015 after reporting 30 pct rise in Q1 production; shares top FTSE midcap gainers
** Says production climbs to 1.1 mln carats from 842,796 carats a year earlier
** Quarterly production at Cullinan rises 44 pct to 208,974 carats
** Best day for shares since July, about a quarter of 30-day average volumes traded in first ten minutes of trade
** Up to Friday's close, stock had risen about 60 pct vs an 83 pct rise in the FTSE 350 Mining index ; co top gainer on index on the day (Sanjeeban.Sarkar.thomsonreuters.com@reuters.net)