What's the difference between i.e. and e.g.?
also blue-chip, in reference to the high-value poker counter, from 1904 in the figurative sense of "valuable;" stock exchange sense, in reference to "shares considered a reliable investment," is first recorded 1929; especially of stocks that saw spectacular rises in value in the four years or so before the Wall Street crash of that year.
Of the best sort; first-rate: a blue-chip stock/ a blue-chip school (1920s+)
[fr the color of the highest denomination of gambling chip]