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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $37,187,515 | 31 | 157,534 |
| 2006 | $37,547,894 | 31 | 154,882 |
| 2007 | $27,115,624 | 26 | 127,874 |
| 2008 | $15,594,640 | 12 | 61,984 |
| 2009 | $8,545,312 | 3 | 16,102 |
| 2010 | $5,607,120 | 0 | 25,079 |
| 2011 | $7,575,779 | 5 | 26,485 |
Note: Quantity represents Weight in carats
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