RADAR mood rings are known to react very sensitively to your personal temperature / mood. Colors of these stones range from orange (content) and yellow (active) to bright blue (relaxed), purple (sad), and deep crimson (stressed).
RADAR Mood Ring Theory suggests that colors represent universal moods, as illustrated below:
Because of the sensitive nature of mood stones, we suggest that you refrain from wearing your RADAR mood ring under water, and especially when swimming in the ocean. Salt water will cause unwanted air bubbles under your stone.
Disclaimer: RADAR Mood Ring Theory is not scientifically proven.