24K

24K is a designation used for gold of the highest fineness in the karat system. A karat is a unit of purity in gold alloys; 24 karat gold (24K) is essentially pure gold, typically around 99.9% gold, with only trace impurities. Pure gold is very soft and malleable, so in jewelry and some industrial uses it is often alloyed to increase hardness (for example 18K, 14K, or other finishes).

In investment and finance, 24K gold is common for bullion bars and coins, marketed to investors seeking high-purity gold. It is also used in electronics and dentistry where high conductivity, corrosion resistance, and biocompatibility are valued, though many products use gold alloys or coatings depending on the application.

In culture and media, 24K is used as a brand or artist name. It is the stylized name of a South Korean boy band, and the term appears in various branding contexts to imply premium quality or luxury.

Some common confusion may arise with 24-karat in general language, or with 24K jewelry labeled as pure gold that may still require set standards or certifications in different jurisdictions.