sjati

1. to shine; to gleam
   Sunce jako sja od jutros. — The sun has been shining brightly since morning.
   Pod sja posle čišćenja. — The floor gleams after cleaning.
2. (of face, eyes) to beam; to glow
   Oči su joj sjale od sreće. — Her eyes were shining with happiness.
   Mladoženja je sjao celo veče. — The groom was beaming all evening.

Sijati (sija) is often used in the same meaning, including reflexive sijati se.