His Majesty struck a similar tone in his opening ceremony speech
The King has released a statement lauding the Commonwealth Games' "climate-conscious" model.
King Charles, who is Head of the Commonwealth, kicked off the multi-sport event last month when he emerged from a life-sized Doctor Who Tardis with Queen Camilla.
He then addressed 14,000 fans in Glasgow's Ovo Hydro arena, where he described the Commonwealth as "a unique and extraordinary family of nations".
The monarch championed environmental action, urging efforts to rid oceans and waterways of plastic pollution.
He then struck a similar tone as he took to social media on Sunday evening following the closing ceremony to extend his "warmest thanks to all those who played a part in making the XXIII Commonwealth Games such a wonderful success."
"It was a great pleasure to be able to open the Games as part of a magnificently executed ceremony celebrating Glasgow, Scotland and the enduring bonds of our Commonwealth family," the statement read.
"You have worked tirelessly, with creativity, dedication and vigour, to deliver ten days of exhilarating sporting competition, along with cultural and artistic celebration.
"I know that the efforts which such an endeavour demands from organisers, officials, volunteers and staff are - just like a certain blue telephone box - far larger than they may appear from the outside…
"Developing and realising a climate-conscious, deliverable model for this year’s Games has been a significant achievement.
"The Games have served as a stage for outstanding athletic excellence, a joyful celebration of all that unites our Commonwealth nations and a powerful reminder of sport’s ability to bring nations and generations closer together."
He concluded by sending "heartfelt congratulations to all those competitors who were victorious, while hoping that each and every one of you who participated, or contributed, will look back on these Games with immense pride in what you have accomplished."
The royal connection to the Commonwealth Games runs deep, and was on display throughout this summer's competition.
LATEST ROYAL NEWS
Prince Edward, in the capacity of Vice-Patron of Commonwealth Sport, and Sophie, Duchess of Edinburgh, attended throughout the Games, including at the opening evening.
There, they were also joined by British Prime Minister Andy Burnham and First Minister of Scotland John Swinney.
On Saturday, the Prince and Princess of Wales were joined by all three of their children, as they watched Australia take on Jamaica in netball.
The occasion marked the first time Prince Louis has attended a public sporting engagement with his parents - and, as ever, the young prince did not sit in silence.
The eight-year-old was seen beaming while wearing a bucket hat, staring with his head in his hands, and later captured yawning in the stands, where he sat between his older siblings, Prince George, 13, and Princess Charlotte, 11.
The next Commonwealth Games will be hosted in Ahmedabad, India, in 2030.






