Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I used this for embedding Photo Images in Resin, to make Coasters. As the Mould has a shiny surface, the Resin came out shiny and beautiful! (As Family pics, cannot share image, sorry) My Family were ecstatic with the results. I thank @GrimmsCraftingTales on You Tube, for the Inspirational Tutorials. Excellent Product!