Rough Diam Prices Climbing(31 Dec)- Summary by Will PurcellRough diamond prices continue to climb, according to Paul Zimnisky's global rough diamond price index. It added another 0.2 per cent last week, pushing it to another 10-year high. Prices are now up 11.4 per cent over the past decade and are just short of the bubbly record high set in early 2011.