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This is a list of countries by primary aluminium production in 2023. [1] Primary aluminium is produced from aluminium oxide which is obtained from bauxite and excludes recycled aluminium. Only countries with a minimum production of 100,000 tonnes are listed.
Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... ( mg / kg ) Price [7] Year Source Notes USD/kg ... (1.277 × 10 22 kg) 0. ...
The BIS Hallmark is a hallmarking system for gold as well as silver jewellery sold in India, certifying the purity of the metal. [1] [2] It certifies that the piece of jewellery conforms to a set of standards laid by the Bureau of Indian Standards, the national standards organization of India. India is the second biggest market for gold and its ...
24-carat gold is pure (while 100% purity is very difficult to attain, 24-carat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-carat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-carat gold is 12 parts gold (12 parts another metal), and so forth.
Despite carbon's resistivity against corrosion, it is still consumed at a rate of 0.4–0.5 kg per each kilogram of produced aluminium. Cathodes are made of anthracite; high purity for them is not required because impurities leach only very slowly. The cathode is consumed at a rate of 0.02–0.04 kg per each kilogram of produced aluminium.
There are seven educational institutes across five cities, and four gemological laboratories under the GJEPC.. Indian Institute of Gems & Jewellery (IIGJ): They include Indian Institute of Gems & Jewellery in Mumbai, Jaipur, Delhi, Varanasi [13] [14] and Udupi [15] [16] [17] along with the Indian Diamond Institute in Surat.
The following is a list of countries by raw aluminium exports. Data is for 2021, in millions of United States dollars, ... India: 723: 1,607: 8,235
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.