Gold and diamond ring, David Thomas, 1975, of fluted bombe design centring a cluster of brilliant-cut diamonds together weighing approximately 1.57 carats, mounted in 18ct gold, size M, maker's mark, London hallmarks for 1975. David Thomas served as Crown, jeweller to the British Monarchy from 1991 to 2007., the present lot was made in 1975 for Exhibition in 1976 at Goldsmiths hall, London.