An accessory lock includes a first connection element, a second connection element and a lock device. The first connection element includes a connection portion and a retaining portion connecting with the connection portion, wherein the connection portion has a holding cavity extending in a direction perpendicular with an axial direction of the connection portion. The second connection element has at least one through hole. The lock device includes a retainer disposed in the holding cavity of the connection portion of the first connection element. At a locked state of the accessory lock, the second connection element is retained and held between the retainer and the retaining portion of the first connection element by the retainer while the first connection element passing through the through hole of the second connection element.

A wrist-worn device clasp that secures a strap of the wrist-worn device. A first mechanical part of the wrist worn device interlocks with a second mechanical part by motion in a first plane in order to resist motion perpendicular to said first plane. The first mechanical part also inhibits a first securing part and a second securing part being separated by tension along the strap substantially perpendicular to the first plane when the first mechanical part and second mechanical part are engaged with each other. The first securing part and the second securing part inhibit separation of the first mechanical part and the second mechanical part by motion parallel to the first plane when they are engaged with each other by motion perpendicular to the first plane.

A clasp including: a first extension link that is formed in a U-shape and in which a closed end side is rotatably supported at one end of a clasp cover of a band; and a second extension link connected to an open end side of the first extension link via a connecting member, wherein, the second extension link is fixed to the first extension link at a position different from a connected position in the connecting member, and the first extension link is fixed to the clasp cover at a position different from the one end of the clasp cover where the first extension link is rotatably supported.

A wrist-worn device clasp that secures a strap of the wrist-worn device. A first mechanical part of the wrist worn device interlocks with a second mechanical part by motion in a first plane in order to resist motion perpendicular to said first plane. The first mechanical part also inhibits a first securing part and a second securing part being separated by tension along the strap substantially perpendicular to the first plane when the first mechanical part and second mechanical part are engaged with each other. The first securing part and the second securing part inhibit separation of the first mechanical part and the second mechanical part by motion parallel to the first plane when they are engaged with each other by motion perpendicular to the first plane.

An item of permanent jewelry involves a Band including a hollow extending longitudinally into the Band from a first terminal end, an internal bar having a first terminal end inserted into the hollow, wherein the Band is connected to the internal bar by at least one pin extending transversely through both the first terminal end of the Band and the first terminal end of the internal bar, and wherein the second terminal end of the Band and second terminal end of the internal bar are coupled together such so that the Band and internal bar collectively form a closed loop such that the closed loop cannot be slid off the person without damaging at least one of the Band, the internal bar or the at least one pin. A method of making an item of permanent jewelry is also disclosed.

A lock ring includes an elongated body including an end having a male portion, including a tip having a transverse cross-section larger in diameter than an adjacent portion of the lock ring body. Another end of the body includes a female portion including a tip having a transverse cross-section larger in diameter than the tip of the male portion of the body. The tip of the female portion defines a groove open to the exterior of the tip of the female portion. The groove is configured for receiving the tip of the male portion of the body, wherein the ends of the body are in a connected position. A cover is configured for closing the groove in the tip of the female portion of the body for securing the male portion of the body in the female portion in the connected position.

A lock ring comprises an elongated body including an end comprising a male portion, including a tip having a transverse cross-section larger in diameter than an adjacent portion of the lock ring body. Another end of the body comprises a female portion including a tip having a transverse cross-section larger in diameter than the tip of the male portion of the body. The tip of the female portion defines a groove open to the exterior of the tip of the female portion. The groove is configured for receiving the tip of the male portion of the body, wherein the ends of the body are in a connected position. A cover is configured for closing the groove in the tip of the female portion of the body for securing the male portion of the body in the female portion in the connected position.

A jewelry clasp having a male connector, a female connector, a locking sleeve, chain connectors and locking cylinders. The chain connectors are connected to outer end surfaces of the male connector and the female connector. The locking cylinders are sleeved onto outer ends of the male connector and the female connector. Positioning locking devices which allow the chain connectors, the male connector and the female connector to be connected together are provided between the locking cylinders and the chain connectors. The female connector is sleeved into one end of the locking sleeve, and a locking device is provided between the female connector and the locking sleeve. The male connector is sleeved into another end of the locking sleeve; an inner end of the male connector is coupled with an inner end of the female connector; another locking device is provided between the male connector and the locking sleeve.

A magnetic clasp assembly includes a first member and a second member each couplable to an end of a bracelet. The first member may be readily secured or removed from the bracelet by actuating a lever. The second member may be coupled to the first member via a second protrusion on the second member being inserted into a first receiving slot of the first member, and a first protrusion couplable to a second receiving slot of the second member. Magnets may be used to ensure the first and second member remain coupled. By actuating the lever to remove the first member, the article of jewelry with magnetic clasp assembly facilitates the convenient attachment and removal of slider charms and other ornamental accessories from the bracelet. Such slider charms may feature designs representing a user's life achievements and interests.

A clasp including: a first extension link that is formed in a U-shape and in which a closed end side is rotatably supported at one end of a clasp cover of a band; and a second extension link connected to an open end side of the first extension link via a connecting member, wherein, the second extension link is fixed to the first extension link at a position different from a connected position in the connecting member, and the first extension link is fixed to the clasp cover at a position different from the one end of the clasp cover where the first extension link is rotatably supported.