 The Grand Master 's insignia were of the same form and design as those of the Knights . In 1831 , however , William IV presented the Grand Master with a star and badge , each composed of rubies , emeralds and Brazilian diamonds . These two insignia were designated " Crown Jewels " in the Order 's 1905 Statutes , and the designation " Irish Crown Jewels " was emphasised by newspapers when they were stolen in 1907 , along with the collars of five Knights ; they have not since been recovered . 
