A system (1) for piercing and positioning a piece of body jewelry or ear jewelry (100) in a skin portion is provided. The system includes a pinching and sighting device having first and second gripping members (10a, 10b) which are adapted to grip a skin portion between them. The gripping members (10a, 10b) include an aiming member (11) to allow alignment of the pinching and sighting device relative to at least the position of the desired entry hole for piercing. Furthermore the pinching and sighting device includes a portion (12a) for arranging and aligning a cartridge (3). The cartridge has a pressing member (31) which is adapted to press at least one piercing member (101) arranged in the cartridge out of an opening (26) formed in the cartridge. A system and a method of preparation before piercing and positioning a piece of body jewelry or ear jewelry are also provided.