Golconda is defined as “a rich mine” or “a source of great wealth.”
Because there’s grim inefficiency and redundancy in smaller municipal systems and because they lack the financing to maintain clean water standards, their purchase by public water utilities with access to technology and capital could be a Golconda for smart, patient investors.
— Malcolm Berko, The Durham Herald Sun, 29 Dec. 2017
Golconda is the name of a historical city and fortress in southern India that thrived in the 16th century as the capital of the Qutb Shahi kingdom, a powerful Muslim sultanate. The name Golconda means “round-shaped hill.” The area was known for its flourishing diamond trade, with its mines producing famous diamonds including the Koh-i-Noor (part of the British Crown Jewels) and the Hope Diamond.
Lord Fawn listened, but said very little. He especially did not say that Lady Eustace had had the stones valued. "They're real, I suppose?" he asked. Mr. Camperdown assured him that no diamonds more real had ever come from Golconda, or passed through Mr. Garnett's hands. "They are as well known as any family diamonds in England," said Mr. Camperdown.
— Anthony Trollope, The Eustace Diamonds, 1871