Team GB sailors Hannah Mills and Saskia Clark have won gold in the women's 470. With victory already in the bag on Wednesday (17 August), the duo were made to wait when a lack of wind at Marina da Gloria saw the regatta postponed.
Having held a 20-point lead ahead of New Zealand rivals Jo Aleh and Olivia Powrie heading into Thursday's rearranged final, Mills and Clark only needed to finish to seal top spot.
Aleh and Powrie claimed silver with France's Camille Lecointre and Helene Defrance taking bronze.
It increases Great Britain's gold medal count to 21, following Alistair Brownlee's success in the triathlon event.
Only disqualification or a technical problem with their dinghy would have denied Mills, 28, and Clark, 36, their gold medal as they opted for a slow and steady cruise across the finishing line, ending the day in eighth place.
Great Britain have now won two gold medals in sailing events after Giles Scott came out on top in the men's finn class.