What kind of Accessory is shown in the picture?
Cufflinks are items of jewellery that are used to secure the cuffs of dress shirts. Cufflinks can be manufactured from a variety of different materials, such as glass, stone, leather, metal, precious metal or combinations of these. Securing of the cufflinks is usually achieved via toggles or reverses based on the design of the front section, which can be folded into position. There are also variants with chains or a rigid, bent rear section. The front sections of the cufflinks can be decorated with gemstones, inlays, inset material or enamel and designed in two or three-dimensional form.
Cufflinks are designed only for use with shirts which have cuffs with buttonholes on both sides but no buttons. These may be either single or double-length ("French") cuffs, and may be worn either "kissing", with both edges pointing outward, or "barrel-style", with one edge pointing outward and the other one inward so that its hem is overlapped. In the US, the "barrel-style" was popularized by a famous 19th-century entertainer and clown, Dan Rice; however, "kissing" cuffs are usually preferred.