| Facts about diamonds Diamonds are the hardest of the known natural materials which makes it very useful for industry and jewelry. Diamonds make excellent abrasives because they can only be scratched by another diamond. Diamonds originate from central and southern Africa, although other sources of diamonds have been discovered in Australia, Brazil, Canada, India, and Russia. About 130 million carats (26,000 kg) are mined annually, with a total value of nearly 9 billion USD. About 100,000 kg are synthesized annually. The diamond has been treasured for more than 2,500 when they where used as religious icons in India. They are commonly valued by the “four c's”: carat, clarity, color, and cut. The cutting of a diamond is a skilled operation, so that the brilliance is shown to the best advantage. Between 50 and 60% of the diamond is lost during the cutting and polishing process. If the diamond is badly flawed then the loss can be significantly higher. The diamond is the traditional gift for the 60th wedding anniversary and also the 75th anniversary, known as the 'double diamond' anniversary. |