Gold is the most cherished valuable metal in history and it is expected to retain it's value throughout time. Even governments keep gold as their reserves. 

In order to make Gold Jewelry, pure gold is mixed with different alloys to make it stronger. Karat is the standard measurement for gold and it shows the purity of gold. 

• 24 Karat is pure gold. 
• 18K is 75% gold and 25% different alloys (copper and silver, etc.) 
• 14K is 59% gold and 41% different alloys
• 10K is 42% gold and 58% different alloys

Gold jewelry is mostly made of 14K and 18K gold. White or yellow gold has the same value but white gold has become more popular in the recent years...