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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $15,456,907 | 4,154 | 10,034,917 |
| 2006 | $124,831,363 | 7,052 | 10,542,949 |
| 2007 | $18,848,923 | 116,877 | 6,979,776 |
| 2008 | $19,655,979 | 3,055 | 4,621,235 |
| 2009 | $9,703,753 | 1,087 | 3,011,597 |
| 2010 | $43,655,403 | 1,815 | 7,102,028 |
| 2011 | $29,588,456 | 1,328 | 4,907,093 |
Note: Quantity represents Weight in carats
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