Can gold ever be 100% pure?

Since 100% pure gold is practically impossible to obtain, the purest type of gold currently available on the market is 999.99.It is sometimes referred to as a five-nines fine. The Royal Canadian Mint regularly produces commemorative coins of this fine gold. Gold is mixed with other metals to make jewelry. Technically, it's impossible to get something 100% pure.

Basically, entropy is a measure of disorder, and the second law of thermodynamics says that in an isolated system (which in the case of gold ingots is the ingot plus its environment) any change that causes an increase in entropy (disorder) will occur spontaneously. Imagine a 100% pure gold ingot, there is no (positional) disorder in the ingot, since all gold atoms are indistinguishable, adding even a small amount of any other element causes a large increase in entropy and, therefore, is spontaneous. Eliminating it causes a very large increase in entropy and is therefore impossible to do so completely. For example, a gold alloy with a fineness of 127⁄128 (i.e., a purity of 99.2%) could have been described as 23-carat, 3-grain, 1-quart gold.

The amount of gold per volume in a gold alloy of less than 24 carats varies depending on the alloy or alloys used. In the case of 10-carat gold, the volume of gold in the alloy represents approximately 26% of the total volume of standard yellow gold. Next, the precious metals experts at First National Bullion and Coin, the best place to buy gold in Scottsdale, take a closer look at some of the countries where you'll find a wider selection of gold that comes very close to the highest possible purity level. To obtain the percentage of the volume of gold in an alloy, divide the volume of gold in cubic centimeters or milliliters by the total volume of the alloy in cubic centimeters or milliliters.

This is especially true for coins, but even gold ingots that spend most of their time in a vault are sometimes manipulated, and it would be bad if a gold ingot at the bottom of a pile had all its marks crushed and was unreadable by pressure. More than half of the world's gold production is dedicated to jewelry, which is by far the most common and popular solid form of gold on the planet. If you prefer gold jewelry in its purest form (24-carat gold), the United Arab Emirates also ranks first, given the wide availability of gold jewelry in this country. It is an extension of the old karat system that denoted the purity of gold in fractions of 24, such as 18 carats for an alloy with 75% (18 parts by 2) of pure gold by mass.