Jewel with wireless communication device

1. A jewel comprising: a main body and at least one wireless communication device accommodated within a cavity formed in said main body, wherein

said at least one communication device is arranged slanting with respect to a bottom wall of said cavity, partly accommodated in an undercut region of said cavity and spaced from the bottom wall and from walls at opposed ends of said cavity, whereby propagation of the signal in the space between said at least one communication device and walls of said cavity is allowed.

2. The jewel according to claim 1 , wherein said at least one communication device is held in said cavity through interference fit between a pair of its opposed faces of said at least one communication device and two opposed lateral walls of said cavity, said opposed faces being different from one first face of said at least one communication device, facing toward the undercut and the mouth of said cavity.

3. The jewel according to claim 2 , wherein said at least one communication device is inserted within said cavity with an orientation such that the plane of the first face facing toward the undercut and the mouth of said cavity forms an acute angle with a plane defined by the bottom wall of said cavity or by the mouth of said cavity.

4. The jewel according to claim 3 , wherein said acute angle is comprised between 4.5° and 7°.

5. The jewel according to claim 3 , wherein said acute angle is 5.8°.

6. The jewel according to claim 1 , wherein leads of an antenna of said at least one the communication device face the undercut region.

7. The jewel according to claim 1 , comprising a plate made of an essentially amagnetic material, which closes the mouth of said cavity, hiding at least part of said at least one communication device from view.

8. The jewel according to claim 7 , wherein the essentially amagnetic material is a hard stone.

9. The jewel according to claim 1 , wherein said cavity has an irregular dodecahedron shape, said cavity being defined by:

a parallelepiped chamber having a first face defining the bottom wall of said cavity, a second face opposite the first one and at which the mouth of said cavity is defined, a third face and a fourth faces orthogonal to the first and the second faces, opposite to each other and defining lateral walls of said cavity-, the parallelepiped chamber being open at a fifth face and a sixth faces orthogonal to the first to fourth faces and opposite to each other, and

two chambers having a right pyramid shape open at the respective base face, said respective base faces coinciding with said fifth and sixth faces of the parallelepiped chamber.

10. The jewel according to claim 9 , wherein the distance between the third and fourth faces of the parallelepiped chamber is such as to provide interference fit with said at least one communication device, essentially equal to the distance between the coupling faces of said at least one communication device,

the distance between the first and second faces of the parallelepiped chamber is such as to allow accommodation of said at least one communication device with the desired slant and spaced from the bottom of said cavity, and

the distance between the fifth and sixth faces of the parallelepiped chamber is such as to allow accommodation of said at least one communication device with the desired slant and spaced from triangular walls of the pyramid-shaped chambers of said cavity.

11. The jewel according to claim 1 , wherein said at least one communication device comprises a Near Field Communication, NFC, microchip.

12. The jewel according to claim 1 , comprising at least one object selected from the group consisting of a precious stone, a pearl, a cameo, a cabochon, a briolette, a chiseling, and an embossing, associated with said main body by retention means at said cavity, said retention means being formed at a perimetral edge of said cavity so as to hide said at least one communication device from a user's view.

13. The jewel according to claim 12 , wherein said at least one object has an identification code etched on an external portion of said at least one object and associated in a one-to-one relation with said at least one communication device.

14. A telematic system, comprising: a jewel ( 4 ) according to claim 1 , and at least one terminal configured to communicate with said at least one communication device to receive at least one identification code associated with said jewel and to communicate via a telematic network with a server; said server being configured to send information associated with said identification code to said terminal.