The last line of IT'S A PLEASURE TO KNOW YOU (Carl Williams) is given as:

But friends's the diamond, and trouble's the diamond mine.

This is obviously a typo for:

But friendship's the diamond, and trouble's the diamond mine.

Also, the author's name is Karl, not Carl. See http://www.karlwilliams.com/end_of_time_lyrics.htm for the author's lyrics.

From the CD "LIVING AT THE END OF TIME" by Karl Williams. Also sung (recorded?) by Faith Petric.