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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $34,068,032 | 515,447 | 6,764,541 |
| 2006 | $30,015,418 | 508 | 4,802,652 |
| 2007 | $34,161,682 | 2,563 | 4,664,669 |
| 2008 | $30,740,380 | 1,511 | 3,606,752 |
| 2009 | $16,432,480 | 350 | 1,644,530 |
| 2010 | $28,394,298 | 817 | 3,306,555 |
| 2011 | $33,354,355 | 836 | 3,137,463 |
Note: Quantity represents Weight in carats
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