I wrote back in January about color change garnets. Now I actually have some in my hand, so I'd like to revisit the subject. Garnet is one of only few gemstones that can exhibit a color change. A color change gem is one that appears to change from one color to another color depending on the light source. The atomic structure of the gemstone reacts differently under the ultraviolet rays in natural sunlight (or fluorescent light) .
I have two different types of material. I have some that are larger stones in the 2 to 3.5ct. range. They have beautiful brilliance and scintillation. The color change isn't 100%. In outdoor light they are a slightly pinkish-brown color but with bright red highlights. In indoor light they are more of a raspberry pink color that reminds me of some pink tourmalines that I've seen. They are really gorgeous stones!
The other ones that I have are the really rare ones that were just discovered in Kenya in the last year. They show a very strong color change from kind of a steel blue in daylight to purple in incandescent lighting. I have 2 of these, both under a carat. These are real collector's items
Follow the link to get more details on some of these color change garnets.