This study aims to identify and prioritize the factors affecting the export of Iranian ornamental stones by employing a mixed-method approach that integrates qualitative content analysis of expert interviews, Multiple Correspondence Analysis (MCA), and a two-round Delphi method. In the first stage, the initial factors were extracted through in-depth expert interviews. Then, to reduce data volume and merge similar or overlapping factors, MCA was applied, resulting in the identification of 21 key factors. These factors were subsequently evaluated by 42 experts in two Delphi rounds. The findings indicated that the level of consensus among experts increased significantly in the second round, and the Friedman test confirmed significant differences in the importance levels of the factors. Ultimately, seven key factors—including international sanctions and restrictions, advertising and marketing, production technology level, customer trust in purchasing Iranian stone, export stone price, diplomatic relations, and the public image of Iranian stone—were identified as strategic determinants. These factors achieved the highest mean scores and ranks in the statistical analyses and showed the lowest variance (standard deviation) among expert opinions. Therefore, managers and policymakers are encouraged to adopt a comprehensive and forward-looking approach and prioritize these areas to support the sustainable development of Iran's stone exports.