Amethyst occurs in primary hues from a light lavender or pale violet, to a deep purple. Amethyst is the world's most popular purple gem. Amethyst may exhibit one or both secondary hues, red and blue. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst is the birthstone of February and an important New Age gem. 

Often viewed as a stone of peace, some believe amethyst's calming presence produces soothing dreams by bringing the dreamer more in tune with the Divine. This clarity and peacefulness also extends to the waking mind. Amethysts are said to help the mind flow freely in both mental and metaphysical dimensions. The gem’s purple colors represented purity of spirit. Thus, amethysts were used to aid the healing of wounds.

Purple amethyst is said to provide emotional support in the form of confidence and calmness. This includes protection from the negativity of stress and anxiety. Many people use this stone for work-related stress and meditation.

Metaphysical crystal practitioners may also believe that amethyst geodes or crystals placed in your home will absorb negative energy and create an air of tranquility in the space. Plus, they claim that amethysts help block electromagnetic frequencies and “geopathic stress” that can foster negativity. 

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sources: 

https://en.wikipedia.org/

https://geology.com/

https://www.gemsociety.org/