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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,134,266 | 1,247 | 11,973 |
| 2006 | $5,513,110 | 0 | 10,447 |
| 2007 | $5,776,959 | 0 | 13,038 |
| 2008 | $6,287,382 | 0 | 16,500 |
| 2009 | $3,594,808 | 0 | 13,728 |
| 2010 | $2,914,723 | 0 | 5,718 |
| 2011 | $1,747,631 | 0 | 10,945 |
Note: Quantity represents Weight in carats
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