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Amethyst
Amethyst is one of the mineral quartz (SiO2) with light purple to dark purple, The name means not drunken in greek as was worn as a amulet against drunkeness, Tabak," commonly used as jewelry. Amethyst is beautiful light purple to dark purple. It has served as a symbol of royalty throughout history of adornment can be traced back to the Minoan period in Greece . Pharaohs, kings and queens, as well as leading lights in religious sects have long treasured it because of its rich, royal color. Interestingly, this fascination with the color purple dates back to Roman times when generals celebrating triumphs got to wear a toga dyed the colour of Amethyst.
Colored by an interaction of iron and aluminum, Amethyst is a variety of macrocrystalline quartz that occurs in transparent pastel roses to deep purples and violets. Now days Amethyst is also availible in green this is due to heating changing the colour from purple to green. It has a mohls hardness of 7 and a refractive index of 1.544-1.553 | 
