Prism is a sheer iridescent blue, and would be great for layering over many different polishes I can imagine, but I was already wearing a-england King Arthur (shown alone here) and decided to try Prism over this, and I am so glad I did. The blue flash from Prism shows up so well, even in lower light (the last picture shows this) but as it is fairly sheer, the grey of King Arthur is still quite visible.
This is 1 coat of the Knight, 1 of King Arthur, 1 of Prism and 1 of the Shield.
Thanks for looking <3