A watch strap includes a substantially inflexible main portion, a flexible auxiliary portion coupled to the substantially inflexible main portion, and a tightener coupled to the flexible auxiliary portion. When in use, the tightener is configured to maintain a selected tightness, and the flexible auxiliary portion is configured to be elastic.

A wristband can comfortably secure an electronic device, such as a wristwatch or fitness/health tracking device, to a wrist of a user. The wristband can include a number of magnets that allow the wristband to be magnetically coupled to itself when folded over or when separate band portions are overlapping. The magnets can include a polymer mixed with a magnetic material to provide magnetic properties and flexibility. The magnets can be joined together by a continuous support structure that extends through opposing pairs of the magnets. The support structure can provide substantial and ability as well as tensile strength. The magnets and the support structure can be surrounded by a flexible cover to protect the components within.

Watch bands can be provided with an ability to dynamically adjust the fit of a watch against a wrist of a user. One or more of a variety of tensioning elements can be provided with a shape memory polymer that responds to a stimulus to adjust a fit of the band. Such stimulus can be from user or actively applied by the watch. The shape memory polymer can be a composite material that provides high durability under cyclic stretching and high speed response of shape recovering while avoiding a drastic moduli drop by shape recovering.

A grey gold alloy which is nickel-free, cobalt-free, iron-free, silver-free, copper-free, zirconium-free, niobium-free, chromium-free and manganese-free, including, expressed in weight percent, from 75.0 to 76.5% of Au, from 15 to 23% of Pd, from 0.5 to 5% of Rh, from 0 to 7% of Pt, and from 0 to 5% of at least one of the alloying elements Ir, Ru, Ti, In, Ga, B and Re, the respective percentages of all the alloying elements adding up to 100%.

A grey gold alloy which is nickel-free, cobalt-free, iron-free, silver-free, copper-free, zirconium-free, niobium-free, chromium-free and manganese-free, including, expressed in weight percent, from 75.0 to 76.5% of Au, from 15 to 23% of Pd, from 0.5 to 5% of Rh, from 0 to 7% of Pt, and from 0 to 5% of at least one of the alloying elements Ir, Ru, Ti, In, Ga, B and Re, the respective percentages of all the alloying elements adding up to 100%.

Functional jewelry is disclosed. A bracelet includes a plurality of light-emitting diodes (LEDs), a main control unit, and positional and situational sensors, typically including an accelerometer, as well as a decorative, interchangeable fascial layer. The bracelet may also include sensors such as capacitive touch sensors, a microphone, and a color sensor. A radio transceiver within the bracelet is adapted to implement a protocol such as BLUETOOTH® 4.0, and is adapted to allow the bracelet to communicate in peer-to-peer or master-slave mode. Two users can pair their bracelets in person, usually with a gestural trigger, for shared light displays, multi-player games, and other types of interactions. Larger groups can pair temporarily and contextually for multi-user displays and interactions, in an ad hoc network with distributed functions. Real-world interactions are communicated to a social network with profiles linked to the individual bracelets.

A wearing band including plural first zigzag springs and plural second zigzag springs. The plural first zigzag springs have axial directions in a length direction of a band body that is formed in a belt shape or a ring shape. The plural first zigzag springs are arrayed in the length direction and a width direction of the band body so as to form a section stretching and contracting in the length direction of the band body. The plural second zigzag springs have axial directions in the width direction of the band body and are arrayed in the length direction and the width direction of the band body so as to form a section stretching and contracting in the width direction of the band body. The plural second zigzag springs have a spring constant different to a spring constant of the plural first zigzag springs.

A versatile jewelry includes a main body having an inner surface arranged to be worn against the wrist and an outer surface opposite the inner surface. First and second end portions define a clearance sized to receive the wrist when the main body is donned by the user. At least one retaining feature comprises a plurality of hooks. A hair band is adapted to be selectively secured to the main body via the at least one retaining feature and to span the clearance at a height above the inner surface. The at least one retaining feature maintains the hair band in place on the main body and distributes pressure from the hair band away from the wrist. The hair band has an elasticity and the main body has a rigidity arranged to maintain the hair band at a height above the inner surface across the clearance.

Watch comprising at least one case and a strap formed by a flexible blade with a first end fixed to the case and a second opposite end provided to cooperate with a device for attaching and adjusting the length of the strap. According to the invention, the adjustment device comprises a clasp formed by a cap and a lever between which the flexible blade slides, the clasp being hinged on the case by linking means which define an axis of rotation about which the lever can undergo a rotation in order to be able to move into an open position and into a closed position, the lever comprising an eccentric which is integral with the lever in the vicinity of the axis of rotation and is provided in order to clamp the free end of the blade against the cap and to retain the strap when the lever is in the closed position.

A fashion accessory and kit for the same. The fashion accessory comprises a first adhesive decoration and a second adhesive decoration connected at an interface. A seam extends at least partially a length of the interface. Each of the first adhesive decoration and second adhesive decoration comprise a face and a back, the face including a design. The first adhesive decoration and second adhesive decoration comprise foam, the foam extending between the face and the back. The first adhesive decoration and second adhesive decoration are mated, back-to-back, to form a charm.