If the pedestal the large diamond had a constant beam of a specific light passing through the diamond constantly . The diamond would produce a specific spectrum of light in the room that could be measured. Even if there were a picture infront of the camera, the change in this specific lighting would change even if there were a picture placed in front of the camera. Using various types of light could produce different traceable effects that may be harder for the thief to detect and make it more obvious for ai to detect.
If the pedestal the large diamond had a constant beam of a specific light passing through the diamond constantly . The diamond would produce a specific spectrum of light in the room that could be measured. Even if there were a picture infront of the camera, the change in this specific lighting would change even if there were a picture placed in front of the camera. Using various types of light could produce different traceable effects that may be harder for the thief to detect and make it more obvious for ai to detect.