silver tongue

No one has ever told of his "silver tongue," or remembered a brilliant after-dinner speech that he has made.

Carson's silver tongue could take on an amazingly sharp edge.

Thus he ended his fourteenth Philippic, and the silver tongue which had charmed Rome so often was silent forever.

We call a soft voice a silver voice, and a persuasive tongue a silver tongue.

So—art thou, then, that teller of tales, whom men call Nicanor of the silver tongue?