During the crystallization process small marks called inclusions naturally appear in a gemstone. This is normal, and minor inclusions will not take away from a gem’s attractiveness or desirability. Some colored gemstones, such as blue topaz, aquamarine, and citrine, have naturally fewer inclusions, while other gemstones, such as ruby, tend to have more acceptable inclusions.
When buying gemstones jewelry (spelled by some: jewellry, or jewlry), try to look for those that have moderate inclusions. Gemstones with few or no inclusions are also available, but are extremely rare and expensive.