Finger ring provided with an adapter device for automatically adjusting the ring size

A ring defining a seat for being worn on a finger and comprising:

• a structure;
• and
• an adapter device for automatically adjusting the diameter of the seat, the adapter device comprising:
• a) at least three arms, equally spaced along an internal periphery of the structure, each one of the arms coupled to said structure so as to rotate between a retracted position and a forward position with respect to the center of said seat;
• and
• b) elastic means radially interposed between said structure and each arm to push each arm to the forward position;
• said elastic means comprising a plurality of parallel and spaced elongated elastic elements,
• wherein each elongated elastic element has a profile substantially extending in a circumferential direction and comprises a wire spring, each wire spring comprising:
• a first end portion having an end fixed to one of said structure and a respective one of said at least three arms at a welding zone;
• and
• a second end portion, opposite to said first end portion along said circumferential direction and arranged resting against the other of said structure and said respective one of said at least three arms.