Amethyst, the violet stone, was traditionally linked to clarity of mind and calm. Dream books read it as spiritual insight and peace after restlessness.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.