She uses her 3D CAD machine (what architects and engineers use) to analyze your actual signature which you’ll send to her via fax, mail, or by uploading it to her site. The machine then creates a 3D sculpture of your signature which you can preview, and if you approve, have machined into gold cufflinks.
The signature has to be cut down to either one or two letters because, you know, that’s the size of cufflinks. You can also choose to have them set with diamonds (either a single diamond or a full set). See some examples below, and then make your own to get a price quote over at cuffhim.com.