Blue Topaz is a MV-tier material. Its lens can be used to obtain Engraved Lapotron Chip, PIC Wafer and Crystal SoC. This gem can be used to craft tools or for decorative purposes. It can be processed in Electrolyzer on MV-tier to obtain its chemical components.
Due to the excessive bulk of including all GregTech 5 blocks and items this navigation box only holds ~10% of all. The reader can view This and This navigation boxes to access the rest.