Apparently we can get to 20GPa with strained silicon (https://www.science.org/doi/10.1126/sciadv.1501382 https://www.science.org/doi/10.1126/sciadv.1501382). Di

Apparently we can get to 20GPa with strained silicon (https://www.science.org/doi/10.1126/sciadv.1501382 https://www.science.org/doi/10.1126/sciadv.1501382). Diamond can theoretically get to 225 GPa (https://www.nature.com/articles/s41467-019-13378-w https://www.nature.com/articles/s41467-019-13378-w). Maybe cubic boron nitride.