The top seed's win had local fans on their feet, 24 hours after the despair of seeing Indian glamour girl Sania Mirza lose the women's singles final in a deciding tie-break to Anastasia Rodionova of Australia.
"A gold medal is tough to come by. I'm happy I got mine. I've worked really hard. Right now, I'm really happy," Devvarman said
"I'm not going to lie, I got a little nervous. It's one of the best feelings for sure. It's a great honour to play for my country."
Devvarman, who has broken into the ATP top 100 this year after a successful US college career, had yet to drop a set all week, but he found fifth seed Jones a handful to start with.
But after pocketing the first set with a single break, he took total command of the second, running off five games games in a row with two breaks of serve to lead 5-0.
He briefly stumbled at match point on his following serve allowing Jones a brief respite, but two games later he completed the rout sparking off noisy celebrations in the stadium.
Jones said he had not been too bothered by a slight leg muscle strain he received at the start of the second half but that the big crowd had unnerved him at times.
"The crowd was a little intimidating. I don't think I was comfortable out there," he said.
Tennis was included in the Games for the first time at New Delhi.
