Amethyst is a purple variety of Quartz often used as an ornament. Upon exposure to heat, Amethyst generally becomes yellow, which some refer to as Citrine or “burnt” Amethyst. It occurs in color from a light, slightly pinkish violet to a deep grape purple. It is widely distributed as a mineral.
Peridot is olivine and a silicate mineral. As peridot is a magnesium-rich variety of olivine