The Diamond Trading Company (DTC) said it would be raising its prices at its fifth sight that runs from June 4 to 8.%%“The DTC constantly reviews its pricing policy and has realigned some areas of its rough diamond pricing,” DTC sales director, Des Cavanagh, said in a statement.%% “The overall effect of the price rebalance will be a low single digit percentage increase which will take effect from the June sight,” he added.