what is the jewel emerald
About Emerald-History and Introduction. Emerald is the most precious stone in the beryl group. The name comes from the old French word 'esmeralde', which was derived from the Greek word 'smaragdos' meaning 'green stone'.By definition, emerald is any medium to dark green beryl colored by chromium.meralds are most often cut in a special cut designed just for this gem; the emerald cut. The emerald cut is a step or trap cut featuring a rectangular or square shape with truncated corners. This cutting style maximizes the beauty and color of the stone, whilst protecting it from mechanical strain and internal stress.