Adopted 12 December 1939 on 92F/11, as submitted by A.J. Campbell, BCLS. Confirmed 7 October 1948 on 92F/11.
Source: BC place name cards, files, correspondence and/or research by BC Chief Geographer/Geographical Names Office.
Regan's 1930 E&N survey party had called this "Emerald Lake"; changed to Gem Lake to avoid duplication.
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office