This is the 10009th most frequent Japanese word.
輝
Radiance; brilliance; to shine.
The word '輝いている' describes the action of 'shining' or 'gleaming' to convey the brightness of stars.
星が美しく輝いている。
The stars are beautifully shining.
Here, '輝いていた' metaphorically represents the vivid or radiant expression in her eyes.
彼女の目は希望に輝いていた。
Her eyes were shining with hope.
In this context, '輝く' is used to describe the physical gleaming effect on the stone.