Grok: Harder than Diamonds ?Discovery of Superhard Carbon Nitride (C3N4)

"Now I want you to discover new compounds that have a Brinell Hardness greater than diamond. Keep testing compounds until one is harder than diamond using both current predictive models and your new theory. As soon as you find a new compound write a detailed plain latex paper describing its properties and the chemical process to create it, and its estimate cost per gram."