CSO RAISES & LOWERS PRICES ON ROUGH De Beers' Central Selling Organisation announced an overall 3% increase in rough diamond prices in July. The action ranges from big increases for big diamonds to actual reductions for smaller, lower-quality stones. The increases average 7% for 1-ct. rough and rise along with the size (anything over the top size category of 10.8 cts. is negotiated individually). Prices fell for some smaller rough (beginning with 11 points, according to some sources). The CSO declines to offer details about the decreases. The price changes reflect an overall strong demand for better-quality diamonds in the retail market, according to CSO sources. They acknowledge that some analysts believe the "rebalancing" of prices for small goods is a move against Australia's Argyle mine, which recently broke from the CSO network. But they say the decrease reflects an oversu

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