Iol

Iol was the name by which iolite (cordierite) was commonly known in the Realms. Another nickname was "violet stone" although the predominating color is usually blue. This stone's color changes with viewing angle, from dark blue to straw-yellow. Small specimens can be transparent but larger stones tend to have inclusions which can cause a star-like effect or, in the case of trapped hematite crytals, a flash of golden color much like sunstones. Iols were usually facet-cut to best display the stone's color change. Legends say this gemstone had a strong affinity for magic. A typical specimen had a base value of 50 gp.