| Sg. Indef. | ópall |
| Sg. Def. | ópallinn |
| Pl. Indef. | ópalar |
| Pl. Def. | ópalarnir |
| Sg. Indef. | ópals |
| Sg. Def. | ópalsins |
| Pl. Indef. | ópala |
| Pl. Def. | ópalanna |
| Sg. Indef. | ópal |
| Sg. Def. | ópalnum |
| Pl. Indef. | ópölum |
| Pl. Def. | ópölunum |
| Sg. Indef. | ópal |
| Sg. Def. | ópalinn |
| Pl. Indef. | ópala |
| Pl. Def. | ópalana |