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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.
English: This chart shows the nominal price of gold along with the price in 1971 and 2011 dollars (adjusted based on the consumer price index). The historical gold price was obtained from www.igolder.com; CPI was obtained from www.rateinflation.com. The data is in section Chart Data.
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.
Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. 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.
18K rose gold: 75% gold, 22.25% copper, 2.75% silver; 18K pink gold: 75% gold, 20% copper, 5% silver; 12K red gold: 50% gold and 50% copper; Up to 15% zinc can be added to copper-rich alloys to change their color to reddish yellow or dark yellow. [3] 14K red gold, often found in the Middle East, contains 41.67% copper.
The 22 kt gold alloy is an English standard traditionally referred to as "crown gold". Crown gold alloys had not been used in U.S. coins since 1834, with the gold content having dropped since 1837 to a standard of 0.900 fine for U.S. gold coins. For American Gold Eagles the gold fraction was increased again to .9167 or (22 karat).