Rogue stone

Rogue Stone is a small magical gemstone whose rainbow colors shift as if in liquid, slowly swirling iridescently, when exposed to sunlight. They are extremely rare and seem to repel each other&mdash;no two rogue stones will ever be found in the same place at the same time. Rogue stones are used to cast the gem-jump spell. A typical specimen has a base value of 5000gp