For some time the Lodge hesitated before coming to the decision to become a Hall Stone Lodge, but at the February, 1921 Meeting an appeal by the then Secretary, W.Bro.F. Read, brought about a decision to do so. On 1st June, 1927, the Secretary had the honour of receiving, on behalf of the Lodge, the Hall Stone Jewel from the hands of the then W.M. The Grand Master, H.R.H. The Duke of Connaught. This jewel is still proudly worn by each successive Master.
Following the 250th Anniversary of Grand Lodge a commemorative jewel was presented to the Lodge indicating that the members had played their part in supporting a Fund which was established to commemorate the existence of Freemasonry through two and a half centuries. The income from this fund is placed at the disposal of the Royal College of Surgeons of England, and each new Master of St. Ambrose Lodge is reminded of this by the jewel which is worn by him in the button position of his collar of office.