In nature the perfectly clear gemstones are very, very rare. There are always smaller or larger blemishes (inclusions or structural irregularities) which, however, grant uniqueness and “personality” to the gemstones and prove their natural, non-synthetic origin. If these blemishes and irregularities are recorded in a plot, on the basis thereof, a given gemstone can be identified at any time. The characteristics of polished diamonds are divided into two groups: internal (i.e. inclusions) and external (i.e. superficial imperfections or blemishes).The internal characteristic are marked with red colour, the external ones – with green colour:
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