Method for obtaining an item with a sparkling polycrystalline surface

A method for obtaining a decorative item (5) having a sparkling appearance, said method comprising the steps of:

• providing or producing a model (1) having a surface (1a) of polycrystalline structure which is intended to be replicated,
• producing a negative replica (2) of said surface (1a) using a polymer material,
• separating the model (1) from the negative replica (2),
• followed by an optional step of:
• producing an object (4), also referred to as a positive replica, on at least a portion of the replicated face (2a) of the negative replica (2),
• wherein one or more actions are implemented during the steps to impart particular optical effects and/or a functional appearance to the decorative item (5), one or more of the actions being selected from the following:
• locally modifying the polycrystalline structure of the model (1),
• modifying the shape of the negative replica (2),
• selectively producing the object (4) on certain portions of the replicated face (2a) of the negative replica (2) if the optional step is carried out,
• the decorative item (5) obtained being either the negative replica (2), or the positive replica (4) if the optional step is carried out.