rose-cut gem with a fine blue colour set in the finial cross of the imperial state crown of England. Reported to date from Edward the Confessor's coronet in 1042, it is one of the oldest gems in the British regalia.
SAINT EDWARD'S SAPPHIRE
Meaning of SAINT EDWARD'S SAPPHIRE in English
Britannica English vocabulary. Английский словарь Британика. 2012