| Name: | DIADEM |
| Type: | Sailing Vessel |
| Launched: | 1825 |
| Completed: | 06/1825 |
| Builder: | William Robson & George Gray |
| Yard: | South Shore, Gateshead |
| Yard Number: | |
| Dimensions: | 377tonsb, 106.3 x 28.7 x ?ft |
| Engines: | None |
| Engines by: | n/a |
| Propulsion: | Sail, rigged as a Barque |
| Construction: | Wood |
| Reg Number: | n/a |
| History: | |
| 11/06/1825 | George & John Mickle, Newcastle |
| 30/07/1835 | Harrop Pringle & Lawrence Leslie, North Shields |
| 04/04/1836 | Harrop Pringle, Lawrence Leslie & Richard Barker Jnr, North Shields |
| 22/11/1840 | Lost |
| Comments: | 22/11/1840: Lost off Cromer |