To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
It's a nice product, as I wanted to use it for a short amount of time before I got my ring replaced. It didn't look too great when it was showing. After a few weeks, I noticed that it was starting to yellow.