Dynamite Radiant 2-in-1 Ring

its states it is 100% sterling silver so why am I reading they tarnish the only reason I purchased was because it said 925 stering silver i will be fuming if it tarnished cant stand false advertisement and lies

poor quality

This band was so beautiful until it wasnt. I added it to my wedding ring, it was really pretty. However, a little over 30days it began to tarnish.