The Diamond Trading Company (DTC) which was to announce its cumulative price-increase by August 15, prior to the August sight scheduled for the week of August 18, has now postponed the announcement to August 19, 2008, reports add. %% The price increase would be a summary of price changes for the entire year, much like a ‘directional snapshot’, for the year. %% In the July sight, DTC increased the prices for diamonds by an average of 5 percent across the board, and of large goods by 15 percent. With all eyes awaiting to see the cumulative price increase, DTC is predicting a strong increase in demand for diamonds, across the globe more so of larger stones, following which the prices will increase further. DTC has set its price changes in accordance with the market changes.