Did you know that ... • The main chemical element of precious stones is oxygen. • Stones are born, grow and die. The life of most of them lasts a very long time, millions of years. A stone, unlike living organisms, in favorable conditions remains unchanged for a very, very long time. He seems to hibernate. • One of the largest (if not the largest) aquamarine crystal in the world was discovered in 1910 in the Marambani deposit near the Mukuri River in Brazil. Its length is 48.3 cm and 41 cm in diameter. Its weight was 110.2 kg.