Revealing mistake: When Michael Douglas attempts to swing on a vine over a deep abyss, the rock that he runs into on the other side moves like a marshmallow, indicating that it's a fake rock. (00:39:10)
Revealing mistake: It's quite visible that the vine Jack uses to cross the gorge is a rope. (00:39:25)
Revealing mistake: When Joan is about to get in the bus at the airport, there's a man in a red shirt walking from right to left who can't help staring at the camera and grinning all the time. (00:19:25)
Revealing mistake: When Jack drives through the field to reach the cave, tyre tracks are already in the grass, showing it was not the first time the scene was shot. (01:15:40)
Revealing mistake: When Jack and Joan's car goes into the river, a rope is visible holding the car to prevent it from flipping over. (01:21:10)
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.