Starshine is a fine linear holographic top coat, meant for layering over other polishes. 

The swatch wheel photo shows, for comparison, Starshine (far left), Starlight (middle), and Starbright (far right), all at one coat over black. 

Starshine has a soft holographic rainbow. If you want a brighter, less subtle rainbow effect, check out Starlight or Starbright.

Rather than offering sets, purchasing three or more bottles of polish from the Sun, Moon, and Stars collection in a single order will give a discount of 3.5% on all Sun, Moon, and Stars collection polishes in the order, which will be reflected in the cart under the line "Sun, Moon, and Stars collection discount."

The last photo shows what Starlight Polish 15mL and 7.5mL bottles look like.