High Quality Content by WIKIPEDIA articles! HMS Diamond is the third ship of the Type 45 or `D` class of air defence destroyer built for the Royal Navy. She was launched in 2007, completed her contractor`s sea trials in July 2010 and arrived at her base port on 22 September 2010. Diamond was commissioned in a traditional ceremony on 6 May 2011, and formally entered service on 12 July 2011.