Since these remarkable gems are fairly rare, they naturally attract the attention of collectors. In some cases all or most of the gems belonging to a particular variety show the phenomenon, in the way that most moonstone exhibit adularesence. But in other cases the optical effect is found only often in a particular kind of gem, and it's the rare cases that are of special interest to collectors. The value of a star gemstone relies on the lucidity and distinctness of the star. Often the star…See More