Shimmering means shining with a soft, unsteady light.
Shimmering makes people think of something pretty and magical.
Examples:
The lake is shimmering in the sun.
Her dress is shimmering in the light.
The stars are shimmering in the night sky.
The water is shimmering like a diamond.
The shimmering stars are like little diamonds in the sky.
The shimmering water looks like it's made of little lights.