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

The correct option is Jean-Baptiste Tavernier.

Detailed Explanation:

Jean-Baptiste Tavernier (1605–1689) was a 17th-century French jewel merchant and globe-trotter. He made six journeys to India during the Mughal period, traveling extensively across the subcontinent.

Tavernier is particularly famous for his detailed documentation of India's diamond mines, most notably those located in Golconda (in present-day Telangana and Andhra Pradesh). In his renowned work, Six Voyages (published in 1676), he elaborately discussed the techniques of mining, trading practices, and the quality of Indian diamonds. He is also famously known for acquiring the Great Mogul Diamond and the Hope Diamond (initially known as the Tavernier Blue).

Brief overview of other options:

• Francois Bernier: A French physician and traveler who spent around 12 years in India, mostly serving as a personal physician to Prince Dara Shikoh and later at the court of the Mughal Emperor Aurangzeb. He wrote Travels in the Mogul Empire.

• Jean de Thevenot: A French traveler who wrote detailed accounts about northern and western India during his travels in 1666.

• Abbe Barthelemy Carre: A French priest and traveler who traveled across India in the late 17th century and wrote about trade and administration.