India 's unique status as a producer of diamonds continued to fascinate Europeans. Marco Polo traveled along the coast of India in 1292, and recorded tales he heard about diamonds being found in deep mountain valleys made nearly inaccessible by heat, lack of water, and venomous snakes. The French traveler Jean Baptiste Tavernier visited the Krishna River diggings in 1665, and estimated that about 60,000 people were mining diamonds.
which foreign traveller discussed diamond mines of india
Jean Baptiste Tavernier