Color scheme for 1-4 ratings

I am task with shading the table cells containing ratings: Good (1) , Better (2), Best (3), Gold (4) or blank (as in not rated). It is possible that in the future another rating would be added - either 0 or 5.

Here is a sample table of the ratings: https://jsbin.com/ratavipuzo/1/edit

our app consists of mainly blue shade colors, e.g.

#b9d4ec
#428bca
#7eb0db

I was hoping someone could help idetifying the appropriate color scheme for the ratings in question, suitable for the app theme and clearly deomnstrating the scale, i.e. Gold is the highest ratings and Good is the lowest.