Flawed Rings

Often the first, partially functional works of apprentice ring creators, flawed rings were relegated to be destroyed in the basement furnaces of arcane schools, the simple end results of the learning process, a measure of progress. However in recent times such rings have made it onto the market, encouraging enterprising apprentices to sell their early efforts to fledgling adventurers for profit

A flawed ring reflects the true purpose of the original, creating an effect in the same vein albeit substantially weaker or limited in some way. As such their appearance is somewhat similar to that of the original rings.