If CMKX had a lot of diamonds, then Urban, family, and friends wouldn't have sold almost all their shares. Do you realize that Urban had 4 million bucks, and made the decision to spend it on a race car instead of buy up the float on CMKX? That is all the information you need to make an intelligent decision.
Therefore, only a friggin' moron believes that Urban and CMKX have a bunch of diamonds at this stage of the game.