Seller ratings have previously only been seen as a feature of paid ads. However, Google has been testing these in Organic Search results.
The Organic seller ratings are taken from businesses ratings in Google Merchant Center. It’s important that SEO’s are aware of this test, as it could affect site traffic. If this is rolled out on a larger scale, Google will have to indicate what influences their seller rating.
These seller ratings could be based on: Google customer reviews, aggregated performance metrics or reviews from your domain. If you aren’t aware of your seller rating, it’s a good time to look it up.