|Hillman Hall of Minerals and Gems
November: Topaz or Citrine
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Topaz is best known as a golden-yellow gemstone, but natural colors include green, pink, red, violet, brown, and light blue. Colorless topaz can be treated with heat and radiation to produce a range of deep blue and blue-green gems. Topaz is very common, especially in Brazil, and is found in California, Colorado, Utah, and much of New England.
Citrine, the yellow variety of quartz, is often used as a low-cost substitute for topaz. Most citrine gemstones result from the heat treatment of amethyst, the purple variety of quartz.
Quartz variety Citrine