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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $56,247,845 | 0 | 2,872,166 |
| 2006 | $53,294,933 | 0 | 11,365,032 |
| 2007 | $43,961,851 | 0 | 6,598,080 |
| 2008 | $36,076,801 | 0 | 2,271,431 |
| 2009 | $30,810,950 | 0 | 2,192,550 |
| 2010 | $25,300,173 | 0 | 3,064,595 |
| 2011 | $37,690,828 | 0 | 4,269,193 |
Note: Quantity represents Weight in carats
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