Before South Africa became prominent in diamond production, which were the two major producers?

The correct answer highlights India and Brazil as the two major producers of diamonds before South Africa rose to prominence in the diamond industry. India was historically known for its diamond production for many centuries, especially with the famous Golconda mines that produced some of the world's most renowned diamonds. Brazil, discovered as a diamond-producing nation in the 18th century, contributed significantly to the global supply of diamonds before South African diamonds dominated the market.

Other regions discussed in the incorrect options, such as the countries listed, either emerged later in the diamond production landscape or were not major players in the diamond trade during the historical period referenced in the question. Australia’s diamond production gained traction in the late 20th century, while Russia became noteworthy in later years after the significant discoveries in the Siberian region. South Africa and Botswana became dominant players after the earlier period when India and Brazil held the spotlight, which helps to clarify the context of when each country emerged in the diamond industry.