Eduard Gübelin

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.

He also founded [http://www.gubelingemlab.com Gübelin Gem Lab]. Provided by Wikipedia