Designed by Nathaniel Barnaby, the Royal Navy Director of Naval Construction, her hull was of composite construction; that is, iron keel, frames, stem and stern posts with wooden planking. She was fitted with a 2-cylinder horizontal compound expansion steam engine driving a single screw, produced by Hawthorn Leslie. She was rigged with three masts, with square rig on the fore- and main-masts, making her a barque-rigged vessel. Her keel was laid at Devonport Royal Dockyard on 8 January 1883 and she was launched on 23 June 1884. Her entire class were re-classified in November 1884 as sloops before they entered service.
Mariner was commissioned into the Royal Navy on 19 March 1885. She became a boom defence vessel in 1903 and was lent to the Liverpool Salvage Association as a salvage vessel in 1917, with her sister-ship . She was laid up from 1922 to 1929 and sold to Hughes Bolckow of Blyth on 19 March 1929.