Diamond processing - Diamonds International CorporationThe price of a diamond has been directly proportional to its weight for hundreds of years. Jewellery was set only with rough diamonds. It was the only way.how are diamonds processed,diamond processingMar 14, 2016 . diamond processing. James S. Loading. Unsubscribe from James S? Cancel Unsubscribe. Working. SubscribeSubscribedUnsubscribe 28.