Eduard Josef Gübelin (1913 – 2005) was a Swiss

gemstone A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewellery, jewelry or other adornments. Certain Rock (geology), rocks (such ...

researcher. Gübelin's studies on gemstone inclusions laid the groundwork for the microscopic identification of gemstones. Gübelin used poetry to validate gemstones, as noted in the book ''Emeralds A Passionate Guide''. Gubelin was one of the first gemologists to recognise the butterfly wing effect in Colombian emeralds. He also founde
Gübelin Gem Lab

References

1913 births 2005 deaths Gemologists Swiss mineralogists {{Geologist-stub