LONDON BLUE TOPAZ

London blue topaz is a type of beryl mineral that belongs to the hexagonal crystal system, which has distinct crystals with a little indentation between them. Other well-known examples of beryl gemstones include emeralds and aquamarines. London blue topaz is relatively sturdy, with a hardness of 8 on the Mohs scale.It is a silicate mineral made up of aluminum and fluorine.