The defender is preparing to become the youngest player to reach a half-century of appearances for the Dragons.
The Reading full-back, likely to feature at centre-half alongside James Collins against Belgium, is aged just 24 but is already more than halfway towards Neville Southall's record tally of 92.
Coleman, who could take charge of his country for the final time in Brussels on Tuesday with his future shrouded in uncertainty, has often bemoaned the fact that so few Welsh players have reached a figure of 70 caps or more, but believes Gunter can go all the way to three figures.
He said: "Players like Neville and Gary Speed (who holds Wales' outfield record of 85 appearances), they didn't have that many caps at his age.
"It would be nice to see some of our players getting up there towards 100 and for him to have 50 caps at 24 is an amazing achievement and a huge positive for us as well as him.
"He never misses a camp, even when he has not been starting games, and he is a really good pro.
"He does his work, the best is still to come for him at just 24.
"That's the type of mentality we are looking for from everyone, whether things are good or bad, he is always here."
Injury-hit Wales face a daunting task as they round off their Group A campaign against winners Belgium, with the Red Devils preparing to celebrate their qualification for Brazil in front of a sell-out crowd at King Baudouin Stadium.
But Coleman has vowed his side will do their utmost to spoil the party.
"You look at Belgium's squad and it is the most expensive squad in Europe," he said.
"Look at what players they have got, they can leave two or three out and the players they replace them with are very strong, experienced and talented.
"They have won the group at a canter and they have not done it for nothing.
"They are a top team, it doesn't matter what team they put out, it is one heck of a test, it is good for us. We are looking forward to it and relishing it. It's a good test."