Abstract: Portable jewellery piece comprising a mechanism for animating an object, said mechanism comprising: —a motive source arranged to drive a transmission; —a regulating system arranged to regulate the speed of rotation of said transmission; —a support system bearing an object that is intended to be animated according to a rotation about a first axis of rotation under the effect of said motive source via a power take-off forming part of said transmission. According to the invention, said support system comprises a first frame that is mounted so as to be able to pivot on a frame element about said first axis of rotation, and an inner frame that is mounted so as to be able to pivot in said first frame about a second pivot axis that is substantially orthogonal with respect to said first pivot axis, said object being moreover arranged so as to be driven by an eccentric driving element that is secured in rotation with a driving wheel arranged to be driven by said power take-off.