Reading through a mid-war letter the other day I came across the expression "black diamonds" and have no idea what it can mean. Has anyone come across this term/slang?
The context was a sailor aboard a dreadnought that had come into port after patrol (home port was Scapa but I guess it could be anywhere on north-eastern coast or western seaboard depending on where they had been patrolling). I dont have the quote at hand but he writes something along the lines of "several black diamonds have arrived". My initial thoughts were is this a Divisional sign but then why would troops be so far north? Another was whether it related to Empire troops? Finally was it a nickname for some ordnance such as a particular shell? There are no other clues I am afraid.
Any suggestions gratefully received.
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