Semi-precious stones are often "treated", sometimes to make them more stable (especially for softer stones such as turquoise), or to enhance the color. And sometimes they're dyed to give a whole new look.
We recently added some stones that have a special "pop" in the color: orange sodalite and mixed impression jasper. Their rich colors fit right in with the season, when the shorter days naturally draw us to strong, deep colors. We have limited quantities.