Other resources

• Gemstones are mineral crystals
  Most gems are minerals. Others, like pearls or amber, are created from living organisms. Usually gems are of a color that mirrors other natural elements we consider beautiful or valuable. Emeralds mirror the lush green of plant life, sapphires are the color of the sky and rubies are a rich blood-red.
  Read more: Gemstones are crystals
• The Colored Gemstone Education - Blue Topaz
  Blue Topaz has become one of the most popular gemstone on the market today, because of its clarity, durability, availability and affordable cost. Yet, it is a shade of Topaz rarely found in nature. The stone's watery blue color is most often created through a combination of heat treatment and irradiation.
  Read more: Blue topaz jewelry