What about gold cufflinks? I just got some double-sided ones in 14kt that belonged to my gradfather. They are shaped and sized like silk knot links, and are borderline tasteful in my opinion.
I wonder though whether gold is too flashy. I can kind of imagine myself wearing them with black tie, but I'm really squeamish about pairing them with a business suit.
Not in something the size of cufflinks, which should be hidden under your jacket cuff most of the time.