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Swiss jeweler, gemologist (1913–2005)
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Eduard Josef Gübelin (1913 – 2005) was a Swiss gemstone 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.
Eduard Josef Gübelin.