Gross domestic product (GDP) is one of the measures used to establish the size of an economy. The GDP calculates the value of all goods and services produced in a country in a year. GDP is often used as an indicator for people's standard of living: generally, the higher a country's GDP, the higher the standard of living of a country's population.
African countries with formal diamond mining - where diamonds are extracted from closed and regulated mines - have high GDP, compared with other countries in Africa. As the map shows, the formal diamond economies of South Africa, Botswana and Namibia have some of the highest GDPs in Africa. (Gabon and Equatorial Guinea, the two other countries in the top five, owe their wealth to large oil reserves.)