ring of truth, the

ring of truth, the

It sounds genuine. This term alludes to the practice of judging a genuine coin by its “ring” or sound, which dates from the days when coins had intrinsic value because they were made of precious metals. Frederick W. Robinson used it in a sermon in 1850: “Truth, so to speak, has a certain ring by which it may be known.”
See also: of, ring
The Dictionary of Clichés by Christine Ammer
See also:
  • ring hollow
  • salt of the earth
  • salt of the earth, the
  • the salt of the earth
  • take something on trust
  • the real McCoy
  • real McCoy
  • real McCoy, the
  • with (one's) hand on (one's) heart
  • with your hand on your heart