A rare rhodochrosite gemstone discovered decades ago in Colorado’s now-closed Sweet Home Mine could sell for thousands of ...
Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our ...
Generally, Tanzanite (or Zoisite) is found in a reddish brown that is heat-treated to turn the stone sapphire blue, amethyst or violet. Heat treatment deepens the blue color saturation but doesn’t ...