HMS Emerald was an armoured frigate, launched in 1861 as HMS Black Prince, renamed in 1904, and sold in 1923.
HMS Emerald was a gunboat launched in 1869 as HMS Hawk. She was renamed HMS Amelia in 1888, HMS Colleen in 1905, HMS Colleen Old in 1916, HMS Emerald in 1918 and HMS Cuckoo later in 1918. She was sold in 1922.