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This lists of mines in India is subsidiary to the list of mines article, and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marbles and other quarries may be included in this list. In India, the underground mine to surface mine ratio is 20:80 [citation needed].
Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London [12] Bismarck Sapphire: Myanmar: 98.56 carats (19.712 g) Table Blue National Museum of Natural History, Washington [13] James J. Hill Sapphire: 22.66 carats (4.532 g) Cornflower National Museum of Natural History, Washington [14]
India's replacement level fertility rate is 2, as of 2023. [28] Replacement levels in the country's larger states range from 1.6 for Punjab and West Bengal, and 3 for Bihar. [28] India's replacement level fertility rate is 2, as of 2023. [28] As of 2023, the average age of India's population is 28.2 years. [29]
Synthetic sapphire—also referred to as sapphire glass—is commonly used for small windows, because it is both highly transparent to wavelengths of light between 150 nm and 5500 nm (the visible spectrum extends about 380 nm to 750 nm [57]), and extraordinarily scratch-resistant. [58] [59] The key benefits of sapphire windows are:
Star of India. The Star of India is a 563.35-carat (112.67 g) star sapphire, one of the largest such gems in the world. [1] [a] It is almost flawless and is unusual in that it has stars on both sides of the stone. The greyish-blue gem was mined in Sri Lanka [3] and is housed in the American Museum of Natural History in New York City.
The list of states and union territories of the Republic of India by area is ordered from largest to smallest. India consists of 28 states and 8 union territories, including the National Capital Territory of Delhi with Rajasthan being largest in land area. [1] [2] [3
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Queen of Asia is the world's largest natural corundum blue sapphire. [1] It weighs 310 kilograms (1,600,000 carats). [2] It was found in Rajawaka in the Balangoda district, and it was revealed in December 2021. Estimated value is USD 150 million (2024) [3]