asterism (gemmology); star pattern in gems
Technical term in gemmology for the optical star-shaped reflection seen in certain polished gemstones such as star sapphires.
Original, now rare meaning referring to the light of stars. Mostly encountered in older or poetic contexts.
The asterism seen in star sapphires is caused by needle-like inclusions.
In old poetry, 星彩 is sometimes used as a word to express the beauty of the night sky.