Piece of jewelery that can be worn by a person and has an ATR spectrometer, which has an ATR crystal (3), which has a frustoconical section (6), a contact surface (9) and a coupling surface (14) opposite the contact surface (9) , an emitter (4) which is set up to emit electromagnetic radiation via the coupling surface (14) onto the lateral surface (8) of the frustoconical section (6), the lateral surface (8) being set up to direct the radiation towards the coupling surface (14) reflect, so that the radiation can be propagated with multiple reflections on the coupling surface (14) and the contact surface (9) in the ATR crystal (3) and then coupled out of the ATR crystal (3) by means of a reflection on the lateral surface (8) is, and has a detector (5) which is set up to detect the coupled-out electromagnetic radiation, the piece of jewelery (1) being set up in such a way that the contact surface (9) f is exposed and thus accessible, so that the contact surface (9) can be contacted with a sample.
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