Gemstone Colors, Interesting Information.
One of the reasons why gemstones are purchased is because of their color. In this write up we will put forward a few random issues of interest related to gem stone colors. The first thing is that nature has provided gems with color. Gemstone manufacturers put gemstones through various treatments, the idea is to either enhance or change the natural color of a gemstone. For example the gorgeous violet-blue tanzanite gemstone starts life as a dull brownish gemstone when mined. It is the heat treatment of rough tanzanite that gives it the vivacious violet-purple color. Similarly aquamarine is known for it's pale blue color but, the gemstone is a greenish-blue or pale green color when mined. Once again heat treatment is used to take off the green tint of the stone and leave it with a pale blue color shade.
Heat treatment is not the only type of treatment given to gems. The fairly ordinary looking white topaz is put through a dose of radiation. This gives us the classic blue collection of topaz gems, including sky blue topaz, swiss blue topaz and the deep london blue topaz. Turquoise is boiled in wax and impregnated with a blue color, blue lapis has a treatment done to give it a uniform blue color throughout the gemstone.
Another interesting thing about gemstone color is that some gems show more than one color in the same piece. This is quite common in certain opaque gems, bloodstone, agates and other jaspers can all have more than one color. However few transparent gems also show a combination of colors. Ametrine which combines the purple shade of amethyst and the yellow shade of citrine is a good example. Tourmaline can sometimes be found with a combination of green and red, this is also referred to as water melon tourmaline.
We also have cases where gemstone colors appear different when viewed from different angles. This is referred to as pleochroism or diochroism. Iolite when viewed from one angle can show a deep violet color. The same gemstone if viewed from another angle can exhibit an almost colorless gem. Other gems like alexandrite can actually change color when exposed to different light sources. Gems showing color change properties are generally priced very high as they are quite rare.
Get to know more about gem stone colors, the Directones report can be seen at http://www.directstones.com/gemstone-colors-01.htm