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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,471 | 65 | 311,469 |
| 2006 | $70,962 | 56 | 283,348 |
| 2007 | $48,780 | 48 | 238,792 |
| 2008 | $138,776 | 160 | 801,088 |
| 2009 | $121,121 | 414 | 2,068,893 |
| 2010 | $44,425 | 74 | 370,874 |
| 2011 | $30,741 | 791 | 3,955,548 |
Note: Quantity represents Weight in carats
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