Lucara Diamond (TSX:LUC) has unearthed a 1,094-carat rough diamond from its Karowe mine in BotswanaThe stone is the sixth over 1,000 carats the company has uncovered at the mine since 2012Lucara produces and sells diamonds from its 100-per-cent owned Karowe mine in BotswanaLucara Diamond stock has added 18.75 per cent year-over-year, but has lost 57.96 per cent since 2019Lucara Diamond (TSX:LUC) has unearthed a 1,094-carat rough diamond from its Karowe mine in Botswana. The stone is the sixth over 1,000 carats the company has uncovered at the mine since 2012 and follows a 2,492-carat stone ann…