From the introduction: This d30 Random Jewelry Generator is patterned after FGM037e: d30 Random Gem Generator in that the GM is encouraged to use the d30 not only to determine the particular "flavor" of treasure item to be generated, but also that item's makeup and how it affects the final value of that particular jewelry piece. These tables are designed to determine the base value of the underlying jewelry piece only. Use the aforementioned table to determine the characteristics of any gems set into jewelry.