LONDON — De Beers Group’s GemFair diamonds are ready for their moment in the sun. After years of investment, and a long-standing pilot program in Sierra Leone, De Beers will offer ethically sourced, artisanal-mined stones for purchase by high-end independent jewelers through its polishing division. More from WWD The stones, which are collected at ground level rather than from craters, are the fruit of De Beers’ GemFair program, which aims to empower independent, artisanal miners. They will be available ...