Final answer:
Prior to 1867, diamonds primarily came from India and later Brazil. The term 'blood diamonds' relates to conflict financing through diamond trade in places like Angola. DeBeers' dominance began with South African diamond discoveries post-1867.
Step-by-step explanation:
The historical sources of diamond production prior to 1867 were mostly limited to a few regions. India was a prominent source for centuries, with famous diamonds like the Koh-i-Noor and Hope Diamond originating there. Later, Brazil emerged as a significant source in the 18th century. Blood diamonds became a term associated with the financing of conflict through diamond trade, notably in countries like Angola. The modern diamond industry was transformed with the discovery of diamonds in South Africa in 1867, leading to large-scale industrial mining operations and the rise of companies like DeBeers.