An end-cap component for installation on an open end of a countertop includes an end-cap front element, and an end-cap stabilizer, which can be solid rectangular pieces or laminated components. The end-cap component can be made in a right-side, left-side or center-mount configuration, and can be glued together with an adhesive and configured with a polished face of the end-cap front element. Also disclosed is a stabilized end-cap countertop system, including a countertop, with an upper surface element and a front edge; and an end-cap component. The system is suitable for manufacturing in stone materials, including engineered quartz, using lighter-weight parts, resulting in improved precision and efficiency of manufacturing and installation.