The story of diamonds is full of intrigue, mystery, and history. 

Formation. Diamonds are formed deep within the Earth's mantle, under immense pressure and at temperatures that are extremely high. They are brought to the surface by volcanic eruptions that carry parts of the mantle upwards. 

Name. The word diamond comes from the ancient Greek word adamas, which means "invincible". 

Ancient beliefs. The ancient Romans believed Diamonds were pieces of fallen stars or tears from the gods. The ancient Greeks believed they were the indestructible tears of the gods. 

Early use. India was the only source of Diamonds in the ancient world, and they were traded as a precious commodity as early as the 4th century BCE. 

European use. By the 15th century CE, Diamonds were a modern accessory for the European elite. 

Brazilian discovery. In the 18th century CE, Brazil became a new source of Diamonds, discovered by people searching for Gold in nearby rivers. 

The Cullinan I. This famous Diamond is currently set in the head of the Sceptre with the Cross, one of the most important symbols of Royal Power in the United Kingdom of Great Britain and Northern Ireland, Canada, Australia, New Zealand and the other eleven Commonwealth Realms. It is on display as part of the Crown Jewels in the Tower of London.

 The rough diamond from which the Cullinan diamonds were cut.