blue-chip
adjective /ˌbluː ˈtʃɪp/
  /ˌbluː ˈtʃɪp/
 [only before noun] (finance)- a blue-chip investment is thought to be safe and likely to make a profit- blue-chip companies
 Word Originearly 20th cent. (originally US): from the blue chip used in gambling games, which usually has a high value.