CuffLinks.com has announced that is has formed a partnership with Jacob & Co. and are now carrying their cuff links online exclusively. Known to be synonymous with celebrity jewelry (clients include Madonna, Beyonce, Jennifer Lopez & David Beckham), Jacob and Co. specializes in fine jewelry and timepieces. As for the world’s most expensive cuff links? $4.2 million emerald cut Canary Yellow Diamonds.

If 4.2 million is a bit out of your price range, check out the full line of Jacob & Co here, starting at  a mere $3,450.