The poket lamp

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is used to search for inclusions in the rough stone before you cut it. The technique is based on the principle that a light ray is invisible.

Let the light fall trough the stone like in the diagramm. Obstacles and inclusions will reflect and deviate the light ray. This makes the hidden inclusions flash.

It is evident that every lapidary examinates his rough stones to discover its inclusions and to decide what shape and cut fits best to add beauty and value to his stone.

Immersion liquids with different refractif indexes simplify the detection of inclusions.