Is it a wedding or engagement ring? This represents a relationship and it's wholeness in your life. This relationship may or may not be romantic, but it represents your desired loyalty. If this ring is actually a ring you own in real life, this represents the real-world connection to the ring such as a marriage, friendship, or lifestyle.
Is it damaged or lost? Is it beautiful and shinning brightly? This represents the actual state of the relationship in your subconscious mind.
Is the ring or circle a stain on something or drawn? This is a direct desire to be or preserve yourself as a whole human being.
If the ring or circle is broken, you feel deeply that you have some work ahead to make yourself whole.
Planets, suns and moons are circular. These represent your desire to seek wholeness out of your present lifestyle. Perhaps it is a fantasy because it is not set in this world, but it is a desire no less.