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Romantic jealousy is one of the most complex emotions people experience in their relationships; people may reach high levels of violence as a result of pathological jealousy. This paper sought to adapt to Spanish language use and examine the psychometric properties of the Interpersonal Jealousy Scale (IJS). This scale evaluates the negative emotion resulting from actual or threatened loss of a loved one to a rival. We used a Colombian sample of 603 Colombian adults (59,03% women). Factor models were tested by Confirmatory Factor Analysis (CFA), in order to confirm the stability of the internal structure of the scale. The CFA supported the robustness of a one-dimensional structure with 18 items. Good internal consistency and evidence of external validity were found, as well as adequate adjustment parameters under the item response theory. In the analysis of the differential functioning of the items by sex, five items measured the different latent trait in men and women. The data indicate that the revised Spanish version of the IJS is a useful instrument to assess romantic jealousy. [ABSTRACT FROM AUTHOR]