● 24 carats: Its degree of purity is 99.9%, which is why it is considered pure gold, 24 of 24K.
● 18 carats: It has a purity of 75%. It's composed of 18 parts of gold 6 parts of other metals such as silver and copper.
● 14 carats: It's composed of 14 parts of gold and 10 parts of other metals, it has a purity percentage of 60%.
● 12 carats: Made up of 12 parts of pure gold and 12 parts of other metals, its purity is 50%.
● 10 carats: It has 10 parts of pure gold and 14 other metals, this having 40% purity.

• 1st Law: We can refer to Sterling Silver when the jewel is made, at least, with a 92.5% purity (i.e. 925 thousandths). That is, if we have a jewel that has 92.5%, we can say that that jewel is made in Sterling Silver.
• 2nd Law: On the other hand, a jewel will be considered to be second law if at least, it has 80% purity (800 thousandths). Therefore, if it has more than 800 thousandths, we may refer to it as Second Law.