Featuring pens with helmets and visors topping their caps, and cuff links that resemble shields, the new S.T. Dupont White Knight collection of accessories (st-dupont.com) references medieval armor. The line’s most exclusive pieces are the Black Knight Diamonds Writing Collector set ($37,500) and the matching Smoking Collector set ($40,000). The Writing Collector set includes a penholder, a paper cutter, a roller nib set, and a fountain pen (shown here) made from black gold with yellow-gold highlights and set with more than 175 diamonds. The Smoking Collector set comprises an ashtray and a lighter.