The term means "ritzy" or "classy." Perhaps it was coined by Robert D. Wood (below)?
9 November 1950, New York Times, pg. 51:
C.B.S. TO PRESENT
TV COLOR TO PUBLIC
Demonstrations Open Tuesday
at Old Tiffany Building, Day
R.C.A. Suit Will Begin
The first local public demonstrations of color television will be initiated Tuesday by the Columbia Broadcasting System. Ten color receivers are being installed on the ground floor of the former Tiffany building at 401 Fifth Avenue, near Thirty-seventh Street, where several hundred persons can be accommodated for each presentation.
1 August 1972, New York Times, pg. 71:
In an interview, Mr. Wood (C.B.S. Television president Robert D. Wood - ed.) spoke fondly of reviving the C.B.S. image as "the Tiffany network."

