Diamonds could be bought already set in jewelry, or offered unset ("free"). Based on the Rio Tinto, in 2002 the diamonds produced and launched to the market had been valued at US$9 billion as rough diamonds, US$14 billion after being minimize and polished, US$28 billion in wholesale diamond jewelry, and US$57 billion in retail gross sales. Erlich, Edward I.; Hausel, W. Dan (2002). Diamond Painting...