Jasnost
Almost all gemstones contain inclusions. Even those most highly prized have at least some inclusions. Flawless gemstones are very rare and very expensive. The best value is found in gems that are lightly to moderately included, like those in Blue Nile gemstone jewelry. Emeralds are typically treated with colorless oil, wax or resin to minimize surface-reaching inclusions.
Střih
Unlike diamonds, with gemstones there isn’t an “ideal” cut geometrically configured for maximum brilliance. But a high-quality gemstone cut is one that presents the most even color, exposes the fewest inclusions, and displays the majority of the gemstone weight when set in jewelry.
Size
The carat weight of a gemstone is not necessarily an accurate gauge for gemstone size. To help you judge the size of a gemstone, Blue Nile lists the diameter of the gemstone when viewed from above – since if the gemstone is set in jewelry; this is the only part of the gemstone that is visible
Enhancements
Nearly all gemstones on the market, including gemstones offered by Blue Nile, have been treated to enhance their appearance. Gemstones that have not been treated but exhibit desirable color and clarity command extravagant prices. Some enhancement treatments are almost universal, are permanent, and require no special care of the gemstone, such as heat treatment to enhance color. Other treatments are common, and may require more or less special care to avoid damage, such as infusion of colorless oil, wax or resin to improve clarity.
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