Etsy seller lucie39 makes 9 possible rings, for $10 apiece.
There are 7 days in a week.
I could wear one of these a day to indicate how I’m “feeling” on that particular day.
“Mood rings for geeks”, if you will!
The other colors:
red (rage), orange (avarice), yellow (fear), green (willpower), blue (hope), indigo (compassion), violet (love), black (death), and white (life)