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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,123,516 | 281 | 1,405,238 |
| 2006 | $1,023,301 | 389 | 1,945,796 |
| 2007 | $975,301 | 180 | 899,090 |
| 2008 | $936,105 | 163 | 815,611 |
| 2009 | $669,164 | 135 | 676,085 |
| 2010 | $711,873 | 0 | 0 |
| 2011 | $977,422 | 140 | 698,619 |
Note: Quantity represents Weight in carats
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