it describes one's speech/ word choice is very elegant
Definitions (粵典–words.hk)
形容詞
每一句説話都好精練到肉 (of words) precise and concise
呢篇文章字字珠璣,大家有時間嘅話就睇多兩次啦!
呢篇文章字字珠玑,大家有时间嘅话就睇多两次啦!
ni1 pin1 man4 zoeng1 zi6 zi6 zyu1 gei1, daai6 gaa1 jau5 si4 gaan3 ge3 waa2 zau6 tai2 do1 loeng5 ci3 laa1! This article is precisely and concisely written. Read a few more times if you have time.
Definitions (Wiktionary)
phrase, idiomatic, of the language of a piece of writing or speech
beautiful and exquisite