In high pressure (HP) research, an achievable static pressure limit is imposed by available strong materials and design of HP devices. Achieving higher and higher pressures will open new horizons for a deeper understanding of matter and the discovery of new physical and chemical phenomena at extreme conditions. Recently we developed a new technique of ultra-high static pressure generation in a double-stage diamond anvil cell. Nanocrystalline diamond (NCD) balls synthesized from glassy carbon were used as secondary anvils. Due to unique properties of NCD, this technique allowed us to reach pressures beyond 1 TPa and to study the behavior of a number of materials at such extreme conditions. In this contribution we will report on unique properties of the NCD material and its applications.