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alexgordonjewelers.com
| Diamond | Clarity Color Cut | Distribution of Diamonds | characteristics of diamonds | History of Diamond | Shape Quality and cutting process | The diamond industry | sitemap |
Gemological characteristics of diamonds
| The use of diamonds as gemstones of decorative value is the most familiar use to most people today, and is also the earliest use, with decorative use of diamonds stretching back into antiquity. The dispersion of white light into a rainbow of colors, known in the trade as fire, is the other primary characteristic of gem diamonds, and has been highly prized throughout history. Over time, especially since around 1900, experts in the field of gemology have developed methods of characterizing diamonds and other gemstones based on the characteristics most important to their value as a gem. Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are carat, clarity, color, and cut. | |
| Most gem diamonds are traded on the
wholesale market based on single values for each of the four
Cs; for example knowing that a diamond is rated as 1.5
carats, VS2 clarity, F color, excellent cut, is enough to
reasonably establish an expected price range. More detailed
information from within each characteristic can then be used
to determine actual market value for individual stones.
Consumers who purchase individual diamonds are often advised
to use the four Cs to pick the diamond that is "right" for
them; to these is sometimes added the "fifth C" of cost. Other characteristics not described by the four Cs can and do influence the value or appearance of a gem diamond. These characteristics include physical characteristics such as the presence of fluorescence, as well as data on a diamond's history including its source and which gemological institute performed evaluation services on the diamond. Cleanliness also dramatically affects a diamond's beauty. There are four major gemological associations which "certify" diamonds: that is, define the four Cs of a diamond. While carat weight and cut angles are mathematically defined, the clarity and color are judged by the trained human eye and are therefore open to slight variance in interpretation. Gemological Institute of America (GIA) was the first laboratory to issue modern diamond reports, and holds the highest reputation amongst gemologists for its consistent, conservative grading. American Gemological Society (AGS) is not as widely recognized nor as old as the GIA, but garners an equally high reputation. International Gemological Laboratory (IGL) is a generally respected laboratory but suffers from a negative industry reputation for its grading practices, which are perceived by critics as being either less conservative or less consistent than the GIA and AGS. European Gemological Laboratory (EGL) has a similar reputation to the IGL. Carat
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| alexgordonjewelers.com | Clarity_Color_Cut | Distribution_of_Diamonds | Gemological_characteristics_of_diamonds | History of Diamond | Shape Quality and cutting process | The diamond industry | sitemap |