Etymology
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blue-chip (adj.)

1904 in reference to the high-value poker counter, also 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 wiped out most of it. See blue (adj.1) + chip (n.1).

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Definitions of blue-chip

blue-chip (adj.)
extremely valuable;
Rembrandt is considered a blue-chip artist
From wordnet.princeton.edu