Most garnets are red but the stone also occurs in orange yellow purple green pink black and other colors. Comparing the shades of colors and transparency will be very interesting. The difference in absorption between two or more directions of light may be too slight to perceive as distinct colors. Instead they may only show a single color regardless of viewing angle. Different gemstones contain element traces in varying amount which lend them a unique colour.
Not all birefringent colored gemstones show pleochroism. Ammolite fossil coral jasper hawk s eye tiger s eye pietersite charoite labradorite scapolite rainbow pyrite rhodochrosite ruby zoisite sugilite andalusite opal mystic topaz and mystic quartz. Gemstones by color. A gem color largely depends on its chemical composition and crystalline structure. The colour of different types of gemstones is so enormous that no exact term defines every individual tone.
Furthermore some biaxial gems may only show two pleochroic colors not three. It is also useful when you want to collect gemstones with your favorite color. Garnet is the name of a group of minerals with a common crystal structure but variable composition. There are several gemstones that show more than one color. Furthermore some biaxial gems may only show two pleochroic colors not three.
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There are several gemstones that show more than one color. Not all birefringent colored gemstones show pleochroism. Most garnets are red but the stone also occurs in orange yellow purple green pink black and other colors.
