RE: The Orion BeltFrom the KRT nr you mentioned:
"Recently, a 10.23 carat diamond was recovered from this drillhole and reported as a dodecahedral aggregate stone with two dimensions measuring 14 mm x 10.5 mm. This diamond is better described as a partially resorbed, complex stone..."
You've brought up a very valid point - just what is the nature of this 10.23 carat diamond? Obviously, it is shrouded in secrecy. They originally alluded to it being an 'aggregate'. The following site shows what an "aggregate, complex stone" may look like.
https://www.johnbetts-fineminerals.com/jhbnyc/diamond7.htm
Nice graphics in your map. The N trend of pipes is obviously the hot spot!