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Know More  Gemstone
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 Color
Size
Clarity
Cut
Enhancements
Care |
While there is no standardized system for judging the color
of gemstones, many jewelers consider it to be the most important criterion for evaluating
gemstones. Color that is vivid, even and saturated throughout the entire stone makes a
gem more valuable.
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Like diamonds, colored gemstone weight is measured in carats. One carat equals
200 milligrams. However, the carat weight of a gemstone is not an accurate gauge of
its size. Some gemstones have higher density (mass per unit volume)
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Each gemstone is comprised of a
unique combination of trace minerals. These create tiny fractures or mineral flaws called
“inclusions.” Under magnification or by their careful unaided eye, gemologists take note of inclusions
as well as “blemishes” or surface irregularities in gems.
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Like color, there is no generally accepted grading
system for gemstone cut. However, like diamonds, a gemstone's cut refers to
its proportions and symmetry. Valuable colored gems will usually have a table,
crown, girdle, pavilion and culet just as diamonds do.
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Almost
all gemstones have been enhanced. They are rare and
very expensive if they have not been enhanced. Before purchasing a gemstone that
has not been enhanced, make sure it has a grading report from a well-known
gemstone-grading lab like the American Gem Trade Association (AGTA).
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You should have a professional jeweler both clean and check the security of your setting, while
you watch, once a year. For general instructions on how to clean and care
for your colored gemstone jewelry, please keep in mind the following recommendations for specific gems.
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