what colors can amethyst be
Amethyst comes in variations of violet. The primary color of amethyst is purple, but it can have red and blue as secondary colors, which can range from very pronounced to virtually invisible. Lighter stones have a pinkish hue, whereas darker ones have a deep purple tone. In general, deeper colors are more desirable and command higher prices.
It might be interesting for you to learn that although amethyst is purple in color, treatment with heat or irradiation can produce yellow, orange, and brown varieties. This type of color-changing treatment is how amethyst can be turned into yellow citrine, which is also a variety of quarts.