In order to fully recognize the quality in the cut of a gemstone, there are several points to consider.

What to Look For
When choosing a sapphire or ruby, ensure that the gem doesn't display the bands of color common to corundum crystals, because if you can see these streaks, you can tell the gem was cut for maximum weight rather than beauty. Finally, when choosing an emerald, ensure none of the fissures and inclusions penetrate deeply into the gem, as it may cause the gem to break if subjected to a blow.

In a gemstone with more In asaturated color, the best cut may be more shallow than average, permitting more light to penetrate the gemstone, while in a less saturated gem, the color may benefit from a deeper cut.
  Gemstone Cut
Look at the gemstone in the setting and ensure that all the facets are symmetrical. An asymmetrically-cut crown indicates a gemstone of low-quality. In all cases, a well-cut gemstone is symmetrical and reflects light evenly across the surface, and the polish is smooth, without any nicks or scratches. These are the characteristics that Blue Nile jewelers look for when selecting our gemstone jewelry.

Like diamonds, fine quality color gems usually have a table, crown, girdle, pavilion, and culet.
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