Shine as a verb means self-luminous. Emitting its own light (or metaphorically so).

  • The sun shines brightly.
  • The winner’s face shone radiantly.

Shine as a noun or adjective means reflective. Reflecting light that falls on it.

  • Put a shine on those boots, lad!
  • The material we have is too shiny.

There appears to be no noun or adjectival form with the sense of light emission. It’s meaningless to say the sun is shiny or has a shine to it.

The verb form can include reflection if suitably qualified or the kind of light is uncertain.

  • The polished metalwork was shining in the sun.
  • The jewellery shone under the lights.
  • The moon shines brightly (reflected light, but not “shiny” and looks like emitted.)