I really like this guy’s expression. It’s completely ambiguous.
Is he slightly pleased with himself for having four jewels in his safe? Is he concerned that it’s a fake? Or is it that he is perplexed that it seems that the jewels are reproducing and he is wondering if it’s because they’re humping?
We may never know.

Maybe it’s because he had 5 jewels and he’s wondering if he left the other one at the scene of the dead hooker…. That wouldn’t be very good for his future if it were true.