Amethyst

Chemical Formula:SiO2-Silicon dioxide
Refractive Index:1.544-1.553
Hardness：7 Mohs
Melting Point：1713℃，heat brittle
Orignal：Uruguay，Brazil，Russia，Africa，Madagascar；

Amethyst owes colors range from purple and violet to pale red-violet. The deep colors are the most valuable,
particularly a rich purple with rose flashes. Amethyst is full of color, and is called "The stone of honesty".
It is the birthstone of February, symbolizing honesty and peace of mind.