Blue Diamond is currently in a state of great melancholy, having mourned the loss of Pink Diamond for thousands of years after her shattering. To Mbuyi Mwanza, a 15-yr-outdated who spends his days shoveling and sifting gravel in small artisanal mines in southwest Democratic Republic of Congo, diamonds symbolize one thing much more rapid: the chance to eat. Fine-jewellery­ sales within the U.S.