Pure gold (24 carat) is soft and can not used to make jewels. In India, it is normally 22 carat and in Europe it is 14 carat and very rarely 18 carat.

It is always the metal in the alloy that makes the colour different.

Normally copper, silver and other base metals form the gold alloy.

• Copper is the most common metal and it forms a red alloy.
• 25% copper in the antique created a rose gold.
• Iron alloys with gold gives blue gold.
• Aluminium and gold give purple gold alloy.
• 14 carat and 18carat with silver give a greenish yellow gold.
• The white gold alloy is made with palladium or nickel.

This is the story of gold colours.