R Keith Mitchell

R. Keith Mitchell, FGA , Tully Medallist and a vice-president of the Gemmological Association, was instructor to the G.A. courses for more than twenty years, and the author of many papers on gemmology.

R. Keith Mitchell, FGA , Tully Medallist and a vice-president of the Gemmological Association, was instructor to the G.A. courses for more than twenty years, and the author of many papers on gemmology. See less