Kuras secured victory in one hour 29 minutes and 55 seconds in Apia, 15 seconds ahead of Solomon Islands' Dianah Matekali - who was wearing shoes.
After the race, the 20-year-old champion told the Pacific Games News Service: “Yes, I won it with only socks on.
“Wearing socks is a personal decision that I made because I had never run with shoes on before, so I didn’t feel comfortable running in shoes at these Games.
"When I tried the shoes on, my feet felt too heavy and I didn’t like it.”
Her gold was her second medal of the Games, after winning silver in the 10,000m on Thursday.
Matekali and Solomon Islands team mate Sharon Firisua claimed silver and bronze respectively.
Matekali finished in 1:30.10 while Firisua was third in 1:32.36.
The men's half marathon was won by Fiji's Avikash Lal, 23, in a time of 1:12.06.
He beat Samuel Aragaw into second place to get revenge on the Tahitian for beating him to gold in the 5,000m earlier this week.
Aragaw finished in 1:14.23 with Guam's Derek Mandell third in 1:15.05.
The men's and women's triathlons also took place on the streets of Apia today, as New Caledonia's Charlotte Robin won a gold medal on the final day of competition to go with her victory on the first day of the Games.
Robin finished in 1:05.07 to win the women's event, having also won the first gold of Samoa 2019 two week earlier - on July 7 in the open water 5km swim.
Salome De Barthez from Tahiti finished second to Robin, just as she did in the Port Moresby 2015 triathlon, in 1:06.48.
New Caledonia's Nathalie Viratelle took bronze in 1:08.05.
In the men's triathlon, Tahiti's Benjamin Zorgnotti won gold, adding to his title from Friday's aquathlon, while team mate Raphael Amour-Lazzari took silver and bronze went to New Caledonia's Patrick Vernay.
Elsewhere, Papua New Guinea completed their clean sweep of the touch rugby competitions with victory over Samoa - who lost all three finals - in the mixed competition.
They beat the hosts 10-9, while Cook Islands won bronze by defeating Fiji 9-5.
Photo Pacific Games News