Because gold is an element.
Stainless steels, zirconium, titanium, gold, platinum metals, other metals; glass, ceramics, wood, textiles, etc.
The reason why there is no substitute for gold or silver is because they are rare and they have a unique properties. They are also not easy to produce, unlike other metals.
Stamped 55 on gold ring
Real gold is heavy in comparison to other metals.
Gold alloys can resist moisture due to the corrosion resistance of gold itself. However, the conductivity of a gold alloy will depend on the other metals in the alloy. Pure gold is an excellent conductor of electricity, but adding other metals can affect its conductivity.
Metals are added to gold to create alloys that improve the hardness, durability, and color of the gold. Pure gold is soft and can be easily scratched or bent, so adding metals like copper or silver creates a stronger alloy suitable for making jewelry and other items. Additionally, mixing metals can alter the color of the gold, creating white gold, rose gold, or other colors.
Silver, Copper, ?? 18 karat gold is 75 % gold and 25 % other metals 14 Kt gold is 58.3% pure and the balance other metals such as silver copper
Other metals are added to gold to create alloys, which can make the gold more durable, alter its color, and change its hardness for specific applications. Common metals added to gold include copper, silver, and zinc to create different shades of gold such as rose gold, white gold, and yellow gold.
Gold is hardened by other metals to make it useable
Gold is a natural source of gold. Gold is a metal. Gold is an element; there are no other metals that are part of gold itself. Ore that contains gold, however, might also contain varying amounts of other metals.
Gold refers to the precious metal in its natural form, which is typically mixed with other metals to increase its strength. Pure gold, on the other hand, refers to gold that is 99.9% pure, meaning it does not contain any other metals or impurities. Pure gold is often used in jewelry and is more valuable than gold that has been alloyed with other metals.
Gold can be mixed with Mercury - formation of an amalgam; also gold can form alloys with many other metals.