The Magic of Rosita Jasper: A Complete Guide The beautiful Rosita Jasper gemstone is an opaque variety of silica belonging to the chalcedony family. It is a perfect blend of micro granular quartz, chalcedony, and other mineral phases, highly preferred for vases, seals, and ornaments. The stone's wide range of vivid colors and shades, vitreous greasy luster, and sparkling shine have made people fall for captive Rosita Jasper Jewelry worldwide.