Why I think slate is more impressive than diamond

I know most people get excited about diamonds because they are shiny and rare. But I think slate is way more interesting due to how it forms under pressure and splits into perfect sheets. For instance, slate starts as shale and transforms without melting, showing Earth's slow changes. Others might say diamonds form deep in the mantle and are harder, making them better. But slate has practical uses like roofs and floors, which diamonds don't. So, which side are you on? Do you value flashy gems or practical rocks more?