Harry Winston Diamond Corporation reports Diavik Diamond Mine Second Quarter Update

Toronto, July 14, 2011 —

Harry Winston Diamond Corporation (TSX:HW, NYSE:HWD) (the “Company”) reports that in the second calendar quarter of 2011, Diavik produced 1.79 million carats from 0.5 million tonnes of ore processed. Ore processed in the quarter was 4% higher, and carats recovered were 11% higher, compared to the same period from 2010, due to an increase in the overall grade of the ore processed. For the first half of the calendar year 2011, Diavik produced 3.14 million carats from 1.0 million tonnes of ore processed.Diavik’s full-year target production remains at 6.9 million carats. Production in the second half of the year is forecast to be higher than the first half of the year as sub-level retreat mining of A-154 South ore, started in early July, will contribute higher grade ore. The sub-level retreat underground mining method is a lower cost and higher velocity underground mining method than the previously planned combination of underhand cut & fill and blast-hole stoping.

The Company will hold three rough diamond sales in its fiscal second quarter ending July 31. Sales in both May and June continue to show price increases. The majority of the diamonds sold so far during the quarter were from the A-418 B type ore. Based on the sales-to-date and the current diamond recovery profile of the Diavik processing plant, the Company has modeled the current rough diamond price per carat for each of the Diavik ore types as follows:

View full press release Harry Winston Diamond Corporation reports Diavik Diamond Mine Second Quarter Update