General Info:

The color-change garnets found in East Africa involve a mixture of the molecules of spessartite and grossular, with a substantial amount of chrome and vanadium incorporated into the chemical composition. Spessartite is the major component, but grossular can be almost half the composition, with almandine or pyrope also in the mix. In the Color Encyclopedia of Gemstones, Joel Arem gives the following information. The spessartite-grossular-almandine color-change garnet has a refractive index of 1.773, with a density norm of 3.98. It appears greenish-yellow brown in transmitted fluorescent light. In reflected fluorescent light, it changes to purplish-red. In incandescent light, it exhibits a reddish-orange to red color.

The spessartite-grossular-pyrope color-change garnet exhibits a change of color from light bluish green in transmitted fluorescent light to purple in reflected fluorescent light. In incandescent light, the color is light red to purplish red. The refractive index is 1.763 with a specific gravity norm of 3.89.

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