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As of 2020, the most expensive non- synthetic element by both mass and volume is rhodium. It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.
The International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur -kilogram, [ 1][ 2] or urkilogram, [ 3] particularly by German-language authors writing in English [ 3][ 4]: 30 [ 5]: 64 ) is an object whose mass was used to define the kilogram from 1889, when it replaced the Kilogramme ...
Platinum as an investment. American Platinum Eagle, the official platinum bullion coin of the United States. Platinum as an investment is often compared in financial history to gold and silver, which were both known to be used as money in ancient civilizations. Experts posit that platinum is about 15–20 times scarcer than gold and ...
During periods of sustained economic stability and growth, the price of platinum tends to be as much as twice the price of gold, whereas during periods of economic uncertainty, [82] the price of platinum tends to decrease due to reduced industrial demand, falling below the price of gold. Gold prices are more stable in slow economic times, as ...
Gold prices (US$ per troy ounce), in nominal US$ and inflation adjusted US$ from 1914 onward. Price of gold 1915–2022 Gold price history in 1960–2014 Gold price per gram between Jan 1971 and Jan 2012. The graph shows nominal price in US dollars, the price in 1971 and 2011 US dollars.
Platinum–iridium alloy. The international prototype of the kilogram (IPK) is an artifact standard of platinum–iridium alloy that was defined as having a mass of exactly one kilogram. Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium . Typical alloy proportions are 90:10 or 70:30 (Pt:Ir).
The history of metallurgy in the Indian subcontinent began prior to the 3rd millennium BCE. [ 1] Metals and related concepts were mentioned in various early Vedic age texts. The Rigveda already uses the Sanskrit term ayas ( Sanskrit: अयस्, romanized : áyas, lit. 'metal; copper; iron'). [ 2]
The Digital Rupee (e₹) [ 39] or eINR or E-Rupee is a tokenised digital version of the Indian Rupee, issued by the Reserve Bank of India (RBI) as a central bank digital currency (CBDC). [ 40] The Digital Rupee was proposed in January 2017 and launched on 1 December 2022. [ 41]