Cuff link
Overview
 
A cufflink is a decorative
Fashion accessory
Fashion accessories are decorative items that supplement and complement clothes, such as jewelery, gloves, handbags, hats, belts, scarves, wigs, watches, sunglasses, pins, stockings, bow ties, hand fans, leg warmers, leggings, neckties, suspenders, and tights....

 fastener worn by men or women to fasten the two sides of the cuff
Cuff
A cuff is an extra layer of fabric at the lower edge of the sleeve of a garment covering the arms. In US usage the word may also refer to the end of the leg of a pair of trousers...

 on a dress shirt
Dress shirt
A shirt, or dress shirt in American English, is a garment with a collar, a full-length opening at the front from the collar to the hem, and sleeves with cuffs. Shirts are predominantly used by men, since women usually wear blouses...

 or blouse
Blouse
A blouse is a loose-fitting upper garment that was formerly worn by workmen, peasants, artists, women and children. It is typically gathered at the waist so that it hangs loosely over the wearer's body. Today, the word most commonly refers to a woman's shirt but can also refer to a man's shirt if...

.

The forerunner of today’s shirt first appeared in the early-16th century, its ruffled wristband finished with small openings on either side that tied together with "cuff strings." Although cuff strings would remain popular well into the nineteenth century, it was during the reign of Louis XIV that shirt sleeves started to be fastened with boutons de manchette, or "sleeve buttons," typically identical pairs of coloured glass buttons joined together by a short, linked chain.

By 1715, simple, paste-glass buttons had given way to pairs of two, decoratively painted or jeweled studs, typically diamonds, connected by ornate gold
Gold
Gold is a chemical element with the symbol Au and an atomic number of 79. Gold is a dense, soft, shiny, malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Chemically, gold is a...

 links.

Hence was born the cuff "link", whether simple glass buttons or gilded and bejeweled studs.

Cufflinks are designed only for use with shirts which have buttonholes on both sides but no buttons.
 
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