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The 3D etching technique allows to affect and modify the core part of a crystal block and to obtain very precise visual effects by using computer numerical controlled laser beams. The transparency of the crystal allows the laser beams to pass through it. Where two beams intersect each other, the intensity increases above a certain threshold, causing a little crack on the material.
Therefore, focusing the laser beams at designed points following a drawing, it is possible to etch the material in a specific 3D shape.