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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $35,892,322 | 430,782 | 285,668 |
| 2006 | $31,212,748 | 279 | 275,505 |
| 2007 | $25,674,396 | 46 | 230,307 |
| 2008 | $25,006,956 | 435,017 | 168,238 |
| 2009 | $13,132,886 | 130,027 | 92,664 |
| 2010 | $9,284,250 | 11 | 46,253 |
| 2011 | $7,152,918 | 11 | 40,208 |
Note: Quantity represents Weight in carats
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