The debut of its sixth patented cut, the Royal Asscher Emerald ... than a century later as the world’s largest gem-quality rough diamond. After studying the 3,106-carat gem for almost a year ...

Mon-Thu, 9:30am-5:30pm, by appointment only; Fri, 9:30am-3:30pm, by appointment only; Sat-Sun, closed This third-generation diamond-district jeweler buys rough-cut diamonds directly from overseas ...

Diamonds become bespoke in the hands of New York-based jeweller K Kane, who converts rough diamonds into initials for fine jewellery ... It requires a very experienced team to source, cut and polish ...