from the introduction:
This adventure takes place within an impressively large, and exquisitely cut gemstone. Each of its twelve facets is a different stone; Ruby, Emerald, Topaz, Sapphire, Citrine, Amethyst, Aquamarine, Kunzite, Peridot, Pearl, Diamond and Onyx. The materials do not appear stuck together, but blend into one another seamlessly. Its craftsmanship is exquisit, and any appraiser worth their salt will identify it as something quite priceless.