It acquires its medium dark to bluish green color from traces of chromium. There are many big emeralds, which are as valueable and famous as diamonds and rubies. Many hundred carats of emeralds are exhibited in the British Museum and the American Mueum of Natural History. In the Schatzkammer in Vienna you can find a 12 cm high jug of 2205 carats, which was cutted out of one emerald crystal. It symbolizes good luck to seamen.
Iron gives it the greenish blue color.
Aquamarins are found on all continents - Brazil, Afghanistan, Burma, India, Kenia, Nigeria, Colorado etc. Often big crystals can be found. The biggest Aquamarin, which had a gemstone-quality, was found in Brazil in 1910. It was 110.5 kilograms heavy, its length was 48.5 cm and its diameter 42 cm. The Name Topaz comes from Topazos, a mine on the island of Zabargad in the Red Sea.