Dalumi Diamonds, Israeli diamond manufacturer has opened a polishing plant in Botswana, according to reports.%%Presently the plant is emplying around 100 people and teh compnay seeks to double its workforce by this year end.%%The plant opened on April 26.%%Being the world’s leading producer of diamonds by value, Botswana government has emphasised the need to develop a secondary cutting and polishing industry in the country to create jobs.