These are the earliest photos I have found of the Queen Mother wearing the floral ruby and diamond brooches (or one of them)
1947 South Africa
1948 Manchester The small fleur de lys is the badge of the Manchester Regiment which the Queen was visiting. From The Illustrated London News 12 June 1948
Was a date given in the article for when the brooches were made?
Sapphire brooch
The other item which I think was worn for the first time in South Africa was the large sapphire brooch. From The Illustrated London News 15 March 1947