A gem (1) comprising a pair of shell parts (2, 3) that can be mutually coupled so as to form a shell (4); the shell (4) comprises an internal cavity (5) that accommodates at least one processor (6) that controls at least one display (7), which is directed toward the outside of a respective shell part (2, 3), and at least one electric charge storage device (8); at least one shell part (2, 3) is made of a material selected preferably from natural materials, synthetic materials, imitation materials, and the like.
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