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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,237,017 | 7,980 | 12,187 |
| 2006 | $4,229,388 | 13,544 | 6,825 |
| 2007 | $3,805,739 | 8,534 | 42,670,000 |
| 2008 | $1,888,307 | 3,507 | 3,845 |
| 2009 | $749,069 | 985 | 886 |
| 2010 | $559,263 | 793 | 832 |
| 2011 | $512,988 | 311 | 545 |
Note: Quantity represents Weight in carats
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