玉ぎょく石せき

noun

gems and stones; wheat and chaff; good and bad

Often used in the set phrase 玉石混交 (or 玉石混淆) meaning 'a mixture of the good and the bad' or 'wheat and tares'. As a standalone noun it refers to gems and ordinary stones, metaphorically the valuable and the worthless.

• このコレクションは玉ぎょく石せき混こん交こうだ。

  This collection is a mixture of gems and junk.

• インターネット上じょうの情じょう報ほうは玉ぎょく石せき混こん交こうだから、注ちゅう意いが必ひつ要ようだ。

  Information on the internet is a mix of good and bad, so you need to be careful.