Emporion, the Greek port located on the coast of northern Catalonia, received classical marbles and their associated influences. The emblematic sculpture of Asclepius-Serapis evidences marble importation dating back to the end of the 2nd century BC. Once the Roman city of Emporiae was established, the use of marble as epigraphic supports begins in the 1st century BC, with a remarkable boom in Augustan times. With the aim of establishing in which cases marble was imported from the Greek world or from other closer sources such as the Pyrenaean marble from Saint-Béat, three Augustan inscriptions on coarse-grained marble have been studied: a plaque dedicated to Marcus Agrippa, one to Tutela and another with the testament of Cornelia Procula. Results from a multimethod analytical approach, combining polarized-light microscopy, cathodoluminescence and IRMS with C and O stable isotope analysis helped us to identify the marble sources. Although they are macroscopically very similar, the analytical parameters obtained have served to differentiate one Saint-Béat marble from the other two with a common Cycladic origin.