Golconda diamonds mining and trading

[3] Actual mining of the Golconda diamonds occurred in alluvial soil settings, alongside river beds, and were found within a few feet of the surface of the land.

[5] After the customary survey of geological formations between the river and the mountains, mining sites were selected and a clay cistern would be prepared on the spot for use in digging.

[7] The raw diamonds from the regional mines were typically then transported to the Golconda (now the western part of Hyderabad[8]) for skilled lapidary, enhancement and further evaluation and sale.

[11][12] In the year 2015, research was conducted by the Centre of Exploration Geophysics (Osmania University) and by the Geological Survey of India.

[18] In the 1600s AD when mines were leased, an agreement—(called Qaul) would be signed under the supervision of regional governors—miners were charged four Pagodas per day for 100 workers, while they will pay monthly rent based on the strength of the workers, provisions, and tobacco were provided with 50 percent extra excise duty while large and exclusive carat of diamonds would only be sold to the ruler with concessions, while Bania community—(a merchant and trading community in India) used to have the majority of holdings and during the early 1600 AD some Dutch miners of Dutch East India Company were granted mining rights.

In 1621–22 AD when Golconda rulers learned about the demand and selling price for Golconda diamonds in Europe, the rulers seized all the mines and temporarily halt the mining process to increase the demand, due to which the price rises up to double.