Gemstone the stone such as color zoning (the uneven distribution of coloring within a gem) and asteria (star effects). The Greeks, for example, greatly valued asteria gemstones, which were regarded as powerful love charms, and Helen of Troy was known to have worn star-corundum. Aside from the diamond, the ruby, sapphire, emerald, pearl (not, strictly speaking, a gemstone), and opal have also been considered to be precious. Up to the discoveries of bulk amethyst in Brazil in the 19th century, amethyst was considered a "precious stone" as well, going back to ancient Greece. Even in the last century certain stones such
The Way of Kings the magical talismans of priest-wizards (the gem encrusted gloves called Soulcasters) that convert matter into another form, such as stone into grain, or people into stone, and powered gemstone constructs known as fabrials, such as a fabrial that creates red light and heat to replace wood in a fireplace. Soulcasting and fabrials are typically only owned by the nobility. The nobility is also based on eye color, blue eyes being seen as the purest royalty due to the association with the legendary Knights Radiant, who had glowing eyes. The world itself has flora and fauna which is based on surviving