Which one of the following foreign travellers elaborately discussed about diamonds and diamond mines of India ?

Jean-Baptiste Tavernier, a 17th-century French gem merchant, is the correct answer because he visited India six times and provided the most detailed eyewitness accounts of the diamond mines in Golconda and the trade of precious stones in his work, *Les Six Voyages*. While Francois Bernier is a tempting choice as a prominent French traveler of the same era, his writings primarily focused on the political administration and socio-economic conditions of the Mughal court rather than the specifics of the diamond industry. This question tests the core concept of identifying the specialized thematic contributions of foreign travelers to the historical understanding of India’s medieval economy and resources.