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Gemstones and Gemology

Jun 27, 2008
Gemstones are the precious stones pieces naturally; these are then polished and finished for the various purposes. The most common purpose of using gemstones is for creating jewellery. There are different varieties of gemstones that seem same but they are different in their composition. Gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology, identify gemstones. The first method preferred by a gemologist is to identify a gemstone by its chemical components. As there is no such grading system for any gemstone universally, other than white (colorless) diamond, this gemstone is graded using a system developed by the Gemological Institute of America (GIA). In olden times, all such gemstones were graded by simply checking their color appearance and visibility. In the early 1950's the GIA system introduced a technical system for this purpose, the prologue of 10x magnification as the standard for grading clarity. Some gemstones are still graded using the old methods or simply by the naked eye. Gemstones have been divided into two groups; precious and semi-precious. These days diamond, ruby sapphire and emerald considered as "precious", these categories was mainly based on trend and the composition of these two lists has changed frequently over time.

Color, cut, clarity and carat are the parameters decided as an aid to help the consumer in understanding the factors that were use to grade a diamond. With few alterations, these specified groups can be useful in understanding the grading of all gemstones. The four criteria carry different weight that depends on their application to colored gemstones or to colorless diamond. In case of diamonds, cut is the most important determinant of value followed by clarity and color. Diamonds has the property to sparkle, to break down light into its constituent rainbow colors, chop it up into bright little pieces and deliver it to the eye (brilliance). This is a basic function of cut. The original rough form of a diamond, is crystalline and will not exhibit these properties. After its proper fashioning or "cutting", diamond show these properties. In case of colored gemstones, including colored diamonds, the purity and beauty of that color is the primary determinant of quality.

There are various physical characteristics that make a colored stone valuable like cut, color, clarity to a lesser extent like emeralds will always have a number of inclusions, remarkable optical phenomena such as color zoning, and star effects. Another most important factor in determining the value of a gemstone is called water. Water is an ancient expression that refers to the combination of color and transparency in gemstones. These the gemstones are being used for the most expensive jewelry, fashion trends, market supply, treatments etc. Nevertheless, diamonds, rubies, sapphires and emeralds still have a reputation that exceeds those of other gemstones. Rare or unusual gemstones generally meant to include those gemstones, which occur so infrequently in gem quality that they are hardly known except to expert.
About the Author
Diamonds UK provides latest collection of diamond Jewellery with combining high class diamonds and gemstones based on London. You can get wide range of diamond rings, engagement Rings, diamond necklaces, diamond bracelets and diamond earrings at http://www.diamonds.uk.com.
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