The colors of the gems change whether viewed in daylight/fluorescent light ( blue or blue-green ) or indoors under incandescent light or yellow light ( rose, pink, or purple). The color change in this group of Fluorite is beautiful and rare.

Some of the most common impurities that cause fluorite to change color include Manganese: This impurity causes fluorite to turn brown or black. Iron: This impurity causes fluorite to turn yellow, orange, or red. Copper: This impurity causes fluorite to turn blue or green.

Fluorite crystals occur in white, black, clear, and various shades of every color in the rainbow. Color change fluorite is rare, but has been discovered, usually with a blue to purple change. To observe this natural phenomenon, view your gemstone interchangeably in natural and incandescent lighting environments.

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More information regarding fluorite:

Fluorite is the mineral form of calcium fluoride, CaF₂. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon.

One of fluorite's more unusual properties is that it will fluoresce, or glow, under ultraviolet light. It was one of the first materials in which the phenomena of fluorescence was recognized and studied, and the term 'fluorescence' actually comes from the mineral name 'fluorite'