José Vidal Martina had already spent years working in the business of semi-precious stones when he began to develop small diamond drill bits for making perforations in the pieces that he made with his stones. ###>Ayant acquis une longue expérience du travail des pierres semi-précieuses, M. José Vidal Martina entreprit un jour de mettre au point de petits forets de diamant pour perforer ses pierres.