If you run an online store, you should definitely check out The Body shop! They have numerous ratings and reviews on more than 50% of their products, which is quite impressive for an online store with hundreds of products!
They also have a nicely designed ratings & reviews widget, with a Testimonial widget that “highlights” a 5-star review for each product, contributing to increase customer trust and thus conversion.
E-commerce solution: Magento 2 / Integration partner: twoday