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Why Pure Gold Is Called 24K

The unit of measurement for the purity of gold is not the familiar percentage (%), but the carat. Therefore, when indicating pure gold, it is expressed as 24K, and gold containing impurities is indicated as 18K and 14K. Since we are familiar with the unit of gold, there is no big problem, but why did they use the number 24? If the number is displayed as 100, it would be easier to calculate, but why did they use 24?
Carat is said to have originated from the ‘carob’ plant, which is a type of plant native to the Middle East. The carob is a tree fruit belonging to the legume family of the genus Serotonia, and the weight of one pod is 1.25g. The people of this region said that they exchanged items such as gold or salt based on the weight of a single pod; therefore, the carob became the standard for weighing, and a single pod is usually held in the hand of an adult, with 24 being the maximum number of pods. It is said that this is where the term ‘24K’ for the purest gold of 99.99% purity originated.
18K has a purity of 18/24, meaning that 75% is gold, and the remaining 25% is other metals such as silver or copper.
You can think of 14K as having 58.5% gold content.

Pure Gold Marked 24K Signifies Permanence

Ordinary metals lose electrons in nature and easily rust, but in the case of gold, since all the electrons in the outermost electron shell of the atom are filled, the structure is stable, and because electrons are difficult to lose, there is a need for a lot of energy to cause a material to change.
Furthermore, the fact that gold is permanent and unchanging also means that it is far from being corroded. Gold, which has an atomic number of 79, is a divalent metal; however, it can also transition into an anion; however, in simple acids such as sulfuric or nitric acid, it does not dissolve, and only in special compounds such as aqua regia can it dissolve.
Because of this, the gold-made artifacts excavated from the tombs of ancient kingdoms remain in their original form even after a long period of time.

The Yellow Color of Gold Signifies Nobility Like Light

The element symbol Au comes from the word for light in Hebrew (aus), and the English word gold also comes from the Sanskrit word for light (jvolita), meaning gold is noble like light.