Eduard Gübelin
Eduard Josef Gübelin 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.
He also founded .