Irish Guards Capstar
The capstar is an eight-pointed star of the Most Illustrious Order of St. Patrick. In the centre is a shamrock, with the State Imperial Crown of Ireland superimposed on each leaf.
Behind the shamrock is the cross of St. Patrick and below are the Roman numerals MDCCLXXXIII (1783), which was the year the order was formed. Appearing above the cross are the Latin words of the regimental motto 'QUIS SEPARABIT', translated as 'WHO SHALL SEPARATE US'.