Supply and install of Natural Stone & Hard Surfaces. The single source to count on when they need stone for almost any type of project — Gemstar Group. “Gemstar Group is an international player in the procurement and placement of hard surface materials,Though the company specializes in dimensional stone, it is also well heeled in ceramic and porcelain surfaces, terrazzo, cultured stone, and unit paving. Gemstar’s principal markets have traditionally been luxury hotels and resorts, condominiums, high-end commercial centers, and mausoleums, Presently branching into theme parks, institutional projects and government works.