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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $360,770 | 38 | 214,431 |
| 2006 | $588,806 | 77 | 374,716 |
| 2007 | $1,071,837 | 203 | 709,889 |
| 2008 | $1,899,189 | 290 | 1,466,951 |
| 2009 | $945,139 | 414 | 2,069,090 |
| 2010 | $764,389 | 130 | 720,906 |
| 2011 | $637,441 | 85 | 427,223 |
Note: Quantity represents Weight in carats
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