During her visit , she unpinned the brooch and offered it for examination to Louis Asscher , nephew of Joseph Asscher , who split the rough diamond .
It was the first time the Queen had worn the brooch publicly .
During Queen 's visit , Queen unpinned the brooch and offered it for examination to Louis Asscher , nephew of Joseph Asscher , who split the rough diamond .
It was the first time the Queen had worn the brooch publicly .