This said the Royal Collection about them ( the pair were on display at this years BP opening)
"These earrings, which are designed to show the greatest possible variety of modern cuts of diamond including half moon, trapeze, square, pear, baguette and emerald, were among the magnificent jewels bequeathed by the Hon. Mrs Ronald Greville to Queen Elizabeth in 1942. Mrs Greville ordered the earrings from Cartier in December 1918 and in September 1922 Cartier supplied the six drops. The earrings were given by the King and Queen to Princess Elizabeth for her wedding in 1947"
Rereading Vickers Queen Mum Bio (p 232) he said :" a set of heavy chandelier earrings later given to P Elizabeth as a wedding present from her parents..."