Visible crew/equipment: In every shot where "the kid" is driving the red sports car, you can see that there is nobody in the car with him - Elaine should be in the passenger seat. Even slumped over unconscious, she'd be visible. (00:13:25)
Visible crew/equipment: At the beginning when the mysterious man is at Joan's door, the manager tells him to get away from the door. The camera moves closer to the bad guy. A piece of equipment produces a shadow on the manager's back.
Visible crew/equipment: During the opening credits sequence, where Kathleen Turner is at home with her cat, she opens a glass cabinet to take out a bottle of alcohol. Throughout this shot we can see a reflection of the camera man (wearing a red t-shirt) directly in front of her face.
Answer: Any emerald over 1 carat in that beautiful cut and condition would probably go for over 250 million. Real emeralds over 5 carats are rare and the price goes up exponentially after 2 or 3 carats. 305,000 per carat after 5. So yeah that one was probably like 800 or more carats.