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Color-change sphene, also known as titanite, is a captivating gemstone that exhibits different colors under varying lighting conditions. Typically, it appears green or yellowish-green in daylight and shifts to a brownish-orange or reddish-orange under incandescent light. This remarkable color change is due to the presence of trace elements like vanadium, which affect how the stone absorbs and reflects light.

Here's a more detailed description:

• Daylight:

  Color-change sphene often displays a vibrant green or yellowish-green hue.

• Incandescent Light:

  Under warmer, artificial light, the stone transitions to a brownish-orange or reddish-orange.

• Chemical Composition:

  The specific shade of color change can vary depending on the concentration and type of trace elements within the sphene, such as vanadium.

• Rarity:

  Color-change sphene is considered rare and highly desirable for its unique optical properties.

• Other Properties:

  Sphene is also known for its high dispersion, which causes it to exhibit a dazzling play of light and "fire" (flashes of spectral colors).