The Book of Eldritch Gemstones

From the introduction: DM: "The chest opens and reveals 200 gold pieces and a chalcedony gem!" PC: "What's chalcedony look like?" DM: Note to self - next time place a potion of gaseous form or perhaps a turquoise gem. User summary: This document presents color images of various gemstones commonly-encountered in roleplaying games, including name and typical cost in gold pieces.