Why did "The Palace" (UK) reject Pasha T'hami el-Glaoui's 'spectacular gifts' in 1953?

Explain – even a monarch should be pleased by magnificent gifts! Why refuse?
In 1953 he attended the coronation of Queen Elizabeth II at Churchill’s invitation, hoping to be knighted. He presented the new queen with spectacular gifts, which were refused. http://news.bbc.co.uk/2/hi/africa/8704571.stm

According to Wikipedia (citing Gavin Maxwell), “The Pasha attended the coronation of Queen Elizabeth II as a private guest of Churchill but his lavish gifts of a jewelled crown and an ornate dagger were refused as it was not customary for gifts to be received from individuals not representing a government.”