| Variable | Source | Unit |
| 1) Diamond Exports from Ghana (DExZ) | Minerals Commission of Ghana11, Ghana Chamber of Mines, Kimberley Process. | Carats |
| 2) Foreign Direct Investment (FDI) | Minerals Commission of Ghana, Ghana Chamber of Mines. | US $ |
| 3) Gross Domestic Product (GDP) | World Bank | % |
| 4) Diamond Prices (DPx) | Minerals Commission of Ghana, Kimberly Process | US $ |
| 5) Real Effective Exchange Rate (REER) | World Bank | % |
| 6) Inflation Rate (INFRATE) | World Bank | % |