The Color of Gemstones
Color of Gemstones. One of the most important issues concerning the attractive features of gemstones is the gemstone's color.
First though, it must be understood that the color of a beautiful gemstone is due to the nature of the light source itself. Daylight often referred to as white light, is in actual fact a mixture of different colors of light detected by our eyes.
As light passes through any material, a little or more of the light spectrum may be absorbed, and then the remaining light passes through the object or is reflected.
The part of the light which is not absorbed by the object land is reflected back to the eye is the color of the gemstone itself.
The beautiful red color of rubies is detected because all of the remaining colors of white light – blue, yellow, green, etc., has been absorbed by the object – a ruby in this case, except the red color which is detectable as it reaches the eye.
Similar gemstones with exact compositions can show different colors. For example, Aquamarine and Morganite have the same chemical composition (both are Beryls) although they exhibit different colors.
Even the same gemstone can occur in different colors. Although the different gemstones formally have the same chemical composition, the actual chemical structure is not exactly the same.
The other reasons for why the same kind of gemstone can have a different color... In the early stages of gemstone formation, impurities can be embedded within the gemstones, and these so-called impurities are in sufficient quantities to absorb certain colors and allow other colors to be unaffected giving us a variation in hue on what a ruby or sapphire will actually look like.
For example, Beryl, which is colorless in its purest mineral form, becomes emerald with the inclusion of Chromium impurities. If Manganese is added instead of Chromium, beryl becomes Pink Morganite. With iron, it becomes Aquamarine.
: http://www.GemstoneJewellery4UK.com
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