Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 222000 | Thousand carats | NA |
| 2003 | 236000 | Thousand carats | 6.31% |
| 2004 | 252000 | Thousand carats | 6.78% |
| 2005 | 256000 | Thousand carats | 1.59% |
| 2006 | 258000 | Thousand carats | 0.78% |
