17 January - 21 January
The biggest known diamond in the universe is a star named Lucy.
21 February - 25 February
Most diamonds are 1 to 3.3 billion years old.
21 March - 25 March
About 28 000 tons of diamonds are mined each year.
25 April - 29 April
Diamonds are nearly 100% carbon and are made up of a single element.
23 May - 27 May
Diamonds are the hardest natural substance on earth. In fact, the only thing that can scratch a diamond is another diamond.
20 June - 24 June
Diamonds come in every colour.
18 July - 22 July
The earliest diamonds were found in India in the 4th century BC.
22 August - 26 August
Diamonds are named after the ancient Greek word "adamas" which means unbreakable.
19 September - 23 September
The largest stone is called the "Star of Africa I" and at 530 carats , is the largest cut diamond in the world.
17 October - 21 October
Diamonds are formed deep within the earth, under intense heat and pressure.
21 November - 25 November
The Greeks believed diamonds were the tears of the gods, and the Romans thought they were shards from the stars.
A diamond over one carat in weight is one in a million.