What significant resource was discovered in Golconda in the early seventeenth century, expanding its source of revenue?

Diamonds

Answer:  Diamonds
Diamonds were discovered in Golconda in the early seventeenth century, expanding the source of revenue.

By the end of the sixteenth century, it was the wealthiest of the Deccan kingdoms. This was largely due to brisk trade from the ports along the east coast, from where iron and cotton goods were shipped to South East Asia. Meanwhile expansive trade continued with Persia, which became a rage in Europe and was greatly valued among painted cottons. Early in the seventeenth century, diamonds were discovered, expanding the source of revenue. The visuals from Golconda draw one’s attention to the gold jewellery worn by both women and men. Besides, the themes of Golconda paintings gained exceptional fame.