DJ K.O. put out an album in 2008 called Picture This... on Shaman Work recordings (big up LG, Craft & JR) that also had a track with Diamond D. That same year, Diamond D showed up back stage at the A3C and I was pretty pumped. I even tried to talk him into playing a set with the Juice Crew, there was some scrambling, but it didn't really work out. The next year Diamond was back and representing at both the Duck Down Showcase and Red Bull Big Tune.
In any event, I found this track via Nah Right. In addition to Diamond, it features Edo G, and Silent Knight. Really good stuff.