Rosita jasper jewelry is an opaque and impure variety of silica. It is a mixture of micro granular quartz and chalcedony. Heavily polished Rosita jasper is used in vases, seals, and jewelry. This type of jasper ranks between 6.5 and 7 on Mohs Hardness Scale, and the specific gravity of this gemstone is generally between 2.5 to 2.9. The refractive index of Rosita Jasper is about 1.54. This stone has streaks of Red, Brown, and Yellow. It has a vitreous to greasy luster. Its color ranges from Brown to pink.