Rhodolite Garnet also has a beautiful physical appearance. This hard stone has a hardness of 7-8 Mohs which makes it a tough one. It has lovely colors ranging from light to dark shades of pink and red including lavender, violet, rosy red, and purple. Its crystal system is perfect and quite shiny with a vitreous luster. Rhodolite Garnet is a high-density gemstone weighing from 3.84 to 3.96 g/cc. These colors do not change mostly, or get washed out by too much sun.