business suits, all the way to very dressy styles such as semi-formal (black tie or Stroller), and formal wear (morning dress or white tie), where they become essentially required and are matched with shirt studs. Colorful and whimsical cufflink designs are usually only suitable for casual and relatively informal events and signals someone who is fun-loving, approachable, and friendly. However, formal wear has stricter expectations, with pearl cufflinks being preferred for white tie events Traditionally it was considered important to coordinate the metal of one's cufflinks with other jewelry such as watch case, belt buckle, tie bar or rings. Sartorial experts prescribe gold to be worn during the daytime and silver for evening wear, but neither expectation is considered as critical as it once was. Fabric cufflinks An alternative type of cufflink is the cheaper silk knot which is usually two conjoined monkey's fist or Turk's head knots. The Paris shirtmaker Charvet is credited with their introduction in 1904. They became quickly popular: "Charvet [link] buttons of twisted braid are quite the style" noted The New York Times in 1908. French cuff shirts are often accompanied with a set of colour-coordinated silk knots instead of double-button cufflinks. They are now often not from silk and consist of fabric over an elasticated core. Owing to the popularity of this fashion, metal cufflinks shaped to look like a silk knot are also worn. Interchangeable cufflinks Interchangeable cufflinks have started to come back into the marketplace in recent years. Cartier introduced their type in the 1960s consisting of a bar with a loop at either end that would allow a motif to be inserted at either end perpendicular to the bar. Cartier referred to the interchangeable motifs as batons. A set including the bars would come with batons made from coral, carnelian, lapis lazuli, rock crystal, onyx, tiger's eye and malachite. Bars would have been made from stainless steel, sterling silver or 18k gold. Cartier recently re-introduced these interchangeable cufflinks with batons made from striped chalcedony, silver obsidian, malachite, sodalite, and red tiger's eye. The accompanying bars are made from 18k gold or palladium plated sterling silver. The securing mechanism is the same for either series using a small screw inset into the looped end of the bar. The pressure exerted by the screw on the baton holds them in place. Another type of interchangeable system was created by pranga & co. The