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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,509,337 | 568 | 66,182 |
| 2006 | $3,471,801 | 4 | 18,120 |
| 2007 | $11,939,170 | 1,826 | 207,319 |
| 2008 | $10,589,525 | 36,963 | 110,554 |
| 2009 | $1,476,545 | 8 | 30,139 |
| 2010 | $998,299 | 64 | 317,703 |
| 2011 | $2,905,645 | 7 | 37,236 |
Note: Quantity represents Weight in carats
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