Aramith is the type of resin used to make pool balls, and I first spied these cufflinks made out of the material on the Paul Smith website. They are not a Paul Smith product though, rather they are made by Belgian jewelry designer Hubert Verstraeten. While you can buy them ready-made from Paul Smith or Vivre, If you go direct to his site, Atelier Verstraeten, you can customize them, choosing from several colors and as many diamonds or semi-precious stones as you can afford. Hubert told me that a plain pair would start at around €60 plus postage, while pairs with a single semi-precious stone start from about €135.