Cultures with no contact with one another, separated by oceans and thousands of years, independently arrived at the same answer. Gold. That is not coincidence or shared superstition. It is chemistry.
The question is worth working through properly, because the reasoning explains what gold is actually for.
Start with everything and eliminate
Imagine choosing a material to store and exchange value, with the whole periodic table available. Most of it disqualifies itself quickly.
Gases and liquids are out. You cannot carry a currency that evaporates or has to be kept in a sealed container.
Radioactive elements are out for reasons that need no explanation.
Reactive metals are out. Sodium and potassium react violently with water. Iron rusts, copper corrodes, lead is soft and toxic. A store of value that degrades in a drawer is not one.
Elements that are too common are out. Aluminium is abundant in the earth's crust. Anything that easy to obtain cannot represent concentrated value.
Elements that are too rare are out too. If a substance is so scarce that ordinary transactions are impossible, it cannot circulate.
What survives is a very short list, and it sits in the same corner of the periodic table: the noble metals, so called because they resist reaction.
Why not platinum
Platinum is rarer than gold and equally resistant to corrosion, so on the face of it it is a candidate. It failed for a practical reason.
Platinum melts at around 1768 degrees Celsius. Gold melts at 1064. Pre modern furnaces could reach gold's melting point comfortably and could not reach platinum's. A metal that cannot be melted cannot be refined, assayed, poured into standard weights or struck into coins with the technology available.
Platinum was known to pre Columbian metalworkers in South America and to Spanish colonists, who named it disparagingly after silver because they could not work it and considered it a nuisance. It only became usable when furnace technology caught up, by which point the monetary role was long settled.
Why not silver
Silver did serve as money, extensively and for a very long time, alongside gold rather than instead of it.
Its limitation is that it tarnishes. Silver reacts with sulphur compounds in air, forming a surface layer that darkens. It does not destroy the metal, but it makes silver less suited to storing value untouched over long periods.
Silver is also more abundant, which made it the practical metal for everyday transactions while gold handled larger sums. Most historical monetary systems used both, at a ratio between them.
What gold has
Gold survives every test at once.
It does not corrode or tarnish. Gold recovered from ancient tombs comes out looking as it did when buried. This is close to unique among metals.
It is workable. Malleable enough to be beaten, drawn and struck with simple tools, and meltable at temperatures achievable with charcoal.
It is divisible without loss. Cut gold in half and you have two pieces of gold. Cut a gemstone in half and you have destroyed most of its value.
It is dense, and distinctively so. Gold is very heavy for its size, which made counterfeiting difficult long before assay technology existed. A gold coin diluted with base metal is noticeably lighter or larger.
It is unmistakable. Gold is the only metal with that colour. Recognition mattered enormously in a world without testing equipment.
It is rare, but not impossibly so. Scarce enough to concentrate value, common enough to circulate.
What changed, and what did not
Gold no longer backs currencies. Countries moved away from the gold standard through the twentieth century, and money today is issued by governments without metal backing.
What did not change is the chemistry. Gold still does not corrode, still cannot be produced at will, and still is not anyone's liability. Central banks continue to hold it for precisely those properties, which is covered in our article on why central banks buy gold.
The monetary role ended. The properties that created it did not.
Frequently asked questions
Why is gold valuable?
Because it combines properties almost no other element has. It does not corrode, is workable with simple technology, divides without loss, is dense enough to resist counterfeiting, is instantly recognisable, and is scarce without being unobtainable.
Why was gold used as money instead of other metals?
Most elements fail on reactivity, abundance, scarcity or physical state. Platinum could not be melted with pre modern furnaces. Silver tarnishes. Gold passes every test.
Why does gold not tarnish?
Gold is chemically inert and does not readily react with oxygen or sulphur compounds, which is what causes tarnishing in other metals.
Is gold still money?
Not as circulating currency. Central banks still hold it as a reserve asset because of the same properties that made it money.
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