According to industry reports, Diamond Circle Capital plc, a closed-ended investment company, is planning to launch an initial public offering on London Stock Exchange’s main market on July 10th.%%As per reports, this is to build a portfolio of large, high-quality white and coloured polished diamonds.%%The IPO is expected to raise approximately $400 million with a minimum investment of around $1 million per individual stone. The minimum offer size is $150 million. Investment manager Diapason Commodities Management S.A. will be responsible for the day-to-day management of the diamond portfolio and other assets.