Unsatisfied with the pace at which the U.S. Citizenship and Immigration Service (“USCIS”) was processing his application for naturalization, in October 2004 Mohammed Gharbi (“Gharbi”) petitioned the district court under 8 U.S.C. § 1447(b) for it to hear his naturalization claim. 1 Just two weeks later, however, a federal grand jury in the Western District of Texas indicted Gharbi for conspiracy, mail fraud, wire fraud, bank fraud, money laundering, and aiding and abetting. Faced with Gharbi’s indictment, the district court reasoned that “a determination regarding [his] eligibility for naturalization would be premature.” It therefore stayed Gharbi’s § 1447(b) action pending resolution of his criminal proceedings. After having twice moved unsuccessfully for the district court to reconsider its stay, Gharbi now appeals the district court’s order denying his second motion for reconsideration, arguing that the court abused its discretion in ordering the stay of his § 1447(b) proceedings. We dismiss Gharbi’s appeal for lack of jurisdiction.

Generally, we have jurisdiction to consider only an appeal from a district court’s final judgment. 2 The parties agree that the district court’s stay order— or, more precisely, its order denying Gharbi’s second motion for reconsideration of the stay order — is not a final appealable judgment. 3 Instead, Gharbi premises our jurisdiction on an exception to 28 U.S.C. § 1291’s final judgment rule: Cohen v. Beneficial Industrial Loan Corp.’s collateral order doctrine. 4

A non-final order “come[s] within the ‘small class’ of decisions excepted from the final-judgment rule” if it “conclusively determine[s] the disputed question, resolve[s] an important issue completely separate from the merits of the action, and [is] effectively unreviewable on appeal from a final judgment.” 5 We have restated this rule with the following elements:

(1) The order must finally dispose of an issue so that the district court’s decision may not be characterized as tentative, informal or incomplete; (2) the question must be serious and unsettled; (3) the order must be separable from, and collateral to, the merits of the principal case; and (4) there must be a risk of important and irreparable loss if an immediate appeal is not heard because the *255 order will be effectively unreviewable on appeal from final judgment. 6

Other than conclusionally stating that the district court’s “stay order is an appealable collateral order,” Gharbi makes no attempt to demonstrate exactly how the order denying his second motion for reconsideration of the stay order meets our four-part test. Despite his omission, however, we conclude that it does not meet the test. And, as Gharbi asserts no other basis for our jurisdiction, we dismiss his appeal.

The four-part collateral order test is conjunctive: If the order does not satisfy even one element, we lack appellate jurisdiction. Here, it is at least arguable that the first three elements have been satisfied. 7 But it is more than arguable-indeed, we find it inescapable-that the fourth element is not satisfied. This is because Gharbi has not demonstrated “a risk of important and irreparable loss if an immediate appeal is not heard because the order will be effectively unreviewable on appeal from final judgment.” 8 Gharbi seems to contend that, by itself, the delay that the stay has caused and is causing to his naturalization proceedings is sufficient to constitute an “important and irreparable loss.” Delay alone, however, is not enough. 9 “Cohen requires some showing of extraordinary harm,” and Gharbi has not made such a showing. 10 This appeal, therefore, is DISMISSED for lack of jurisdiction.