1. Opal is known for its unique display of flashing rainbow colors called play-of-color.
  2. Opals are made up of sub-microscopic spheres stacked in a grid-like pattern similar to layers of Ping-Pong balls in a box. This structure breaks up light into spectral colors and the colors you see depend upon the size of the spheres.
  3. The Bedouins believed that opals contained lightning and fell from the sky during thunderstorms.
  4. Opal contains up to 20% water trapped in its silica structure.
  5. In ancient Rome, Opal symbolized love and hope.