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World natural diamond production for 1993 is estimated to be between 104 and 110 million carats. Of 4,000 known kimberlite/ lamproite occurrences, less than 60 have been mined with only about 15 major producers (0.375% of all pipes). Only seven mines that produce more than 3 million carats per annum have been discovered since 1950. Exploration strategy, world production, sizes of pipes, quality and...