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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $259,611 | 278 | 1,184,233 |
| 2006 | $261,579 | 371 | 1,287,165 |
| 2007 | $337,227 | 344 | 1,670,284 |
| 2008 | $274,173 | 275 | 1,395,416 |
| 2009 | $194,455 | 150 | 723,391 |
| 2010 | $309,145 | 339 | 1,656,306 |
| 2011 | $242,430 | 285 | 1,423,460 |
Note: Quantity represents Weight in carats
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