Just an impromptu translation joke.
The pearls with the unbelievable luster are called ?Guai Se? 怪色 pearls.
"Guai 怪" means ?monster, demon? or ?unbelievable, strange, terrific or quite, very much? etc.
"Se 色" means ?luster, color? or ?colorful, erotic? etc.
My first thought is to call them...