Amethyst
| Name | Amethyst |
| Type | Fishing vessel (smack) |
| GRT | 57 tons |
| Country |  British |
| Built | 1901 |
| Builder | Henry Reynolds (& Co.), Oulton Broad |
| Operator | Frederick Thomas Dewing, Lowestoft |
| History | Fishing registration: LT 405 |
U-boat attacks on Fishing vessel (smack) Amethyst
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 13 Aug 1915 | UC 5 (Herbert Pustkuchen) | Sunk | Stopped and scuttled 7 miles ESE of Lowestoft | 0 |
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