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
William S. Stone William S. Stone General William Sebastian Stone (January 6, 1910 – December 2, 1968) was an American United States Air Force Major General and the third Superintendent of the United States Air Force Academy. His final assignment was as the air deputy to the Supreme Allied Commander Europe. Stone was born at Cape Girardeau, Missouri on January 6, 1910. After graduating from high school in St. Louis, he attended the United States Military Academy, and, upon graduation on June 12, 1934, was commissioned a Second Lieutenant. Upon completing flying training in October 1935, he was assigned to the 32nd Bomb