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The preliminary mechanical polishing of a rough diamond stone in a Surat factory. A rough stone can lose up to 50% of its original weight throughout the polishing process. Surat has become the Indian centre for the diamond polishing industry, as the diamonds imported here can be processed by a lower-waged workforce. The Surat Diamond Employers Association estimates that over 10,000 small workshops are in operation, employing a workforce of over a million.