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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,303 | 41 | 205,000 |
| 2006 | $30,616 | 95 | 0 |
| 2007 | $21,340 | 302 | 1,510,000 |
| 2008 | $16,843 | 325 | 1,625,000 |
| 2009 | $19,814 | 301 | 1,505,000 |
| 2010 | $78,674 | 2,778 | 13,890,000 |
| 2011 | $40,053 | 2,147 | 10,735,000 |
Note: Quantity represents Weight in carats
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