Marcus &amp; Co. Edwardian Diamond Bow Brooch. A gorgeous, bright white, high quality old mine-cut diamond, weighing 1.40 carats, is tied-up in a pretty bow in this exemplary Edwardian delicacy by Marcus &amp; Company - circa 1910. Expertly hand crafted in platinum over 18K rosy-yellow gold, the flowing ribbons sparkle with small old mine-cut diamonds, and the dangling bottom ribbons are articulated in the center and on top for fluid movement