DTC March sight estimated at $200 mil. with pickup in demand and prices for rough diamonds. De Beers cuts DRC exploration and significantly reduces London staff. ALROSA to sell $500 mil. in rough to 15 Antwerp firms in ’09. S&P suspends credit rating for ALROSA citing lack of disclosure of financial information. Hong Kong Jan./Feb. jewelry sales -3% with total retail -2% to $6.2 bil. Sotheby’s H…