HMS Sapphire (1651)
 Sapphire was a 38-gun fourth-rate frigate of the English Royal Navy originally built for the navy of the Commonwealth of England by Peter Pett I at Ratcliffe and launched in 1651.Unlike many of her half-sisters Sapphire seems to have never had additional guns added to her after completion; indeed by 1666 she carried just 36 in wartime (and 30 in peacetime) with 12 culverins and 10 demi-culverins on the lower deck and 14 sakers on the upper deck.