Prime Minister General Prayut Chan-o-cha and his wife Naraporn Chan-o-cha were this week presented with a special award titled "Khu Kwan Jai Phetch" (diamond heart couple) for wearing the best Thai costumes while attending the royally initiated winter festival, Oon Ai Rak Klay Kwam Nao, at Bangkok’s Royal Plaza and Sanam Suea Pa.