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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $351,597,693 | 25,194 | 623,552 |
| 2006 | $356,480,786 | 23,482 | 496,752 |
| 2007 | $332,390,363 | 95 | 460,917 |
| 2008 | $509,074,658 | 107 | 487,214 |
| 2009 | $369,480,902 | 89 | 437,953 |
| 2010 | $326,689,253 | 69 | 329,801 |
| 2011 | $407,969,369 | 78 | 379,408 |
Note: Quantity represents Weight in carats
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