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Émeraude in Cherbourg harbour, 31 July 1909
|Speed:||11.5 knots (21.3 km/h; 13.2 mph) surfaced
9.2 knots (17.0 km/h; 10.6 mph) submerged
|Range:||200 mi (320 km) at 7.3 kn (13.5 km/h; 8.4 mph)|
|Complement:||21, later increased to 23|
|Armament:||6 × 450 mm (18 in) torpedo tubes
1 × 37 mm (1 in) deck gun (Topaze and Turquoise only)
The six boats of the Émeraude class saw action during the First World War.
The Émeraude class had a displacement of 392 tons surfaced and 425 tons submerged. They had an surface endurance of 200 miles at 7.3 knots and a submerged endurance of 100 miles at 5 knots, with a maximum surface speed of 11.5 knots, and a submerged speed of 9.2 knots. Their armament was six torpedo tubes (4 forward and 2 aft). The Topaze and Turquoise had a single 37mm gun, and were manned by crews of 21 men (later increased to 23 men).
- Emeraude (Q41) was commissioned on 6 August 1906, and scrapped in November 1919.
- Opale (Q42) was commissioned on 20 November 1906, and scrapped in November 1919.
- Rubis (Q43) was commissioned on 26 June 1907, and scrapped in November 1919.
- Saphir (Q44) was commissioned on 6 February 1908, and sunk in 15 January 1915 during the Gallipoli Campaign.
- Topase (Q45) was commissioned on 2 July 1908, and scrapped in November 1919.
- Turquoise (Q46) was commissioned on 3 August 1908, and was damaged by Turkish gunfire and beached on 30 October 1915. The Turkish forces changed her name to Mustadieh Ombashi (Mustecip Ombasi) after they re-floated her, but she was never commissioned. She was returned to France in 1919 and was scrapped in November 1919.