The implementation could possibly be extended to cover more weak points.
For example, you could cover the diamond with additional chips in all sides. Or you could make the chip so fragile that it breaks when the diamond is affected by strong enough vibrations (as is likely, with a diamond cutter). Or you could create more complex (but hard/impossible to tamper with) chips that continuously confirm stuff like “no object has come within 10cm of the diamond” or “the temperature remained regular” or “the weight on the pedestal is exactly X grams”.
My main proposal here is the concept of having better sensors that can’t have their data faked. I think with enough engineering effort you could cover enough “edge cases” that you can trust the AI system to predict robbery every time robbery happens, because a mistake/deception has improbably low odds of happening.
Correction: community notes users only need to be phone-verified, not blue-check-verified.