G. Robert Crowningshield For over 60 years students of Gemology have struggled with spectrums; bewildered by birefringence, and simply plagued by pleochrosim. The following sonnet is guaranteed to bring a smile to your face, a glow to your heart, and a simple reminder that students of life and gemology re-discover natures gifts all over again, every day. The following is reprinted with very minor edits from The Loupe, vol. V, No.2, Mar-Apr, 1953 p. 3. Courtesy of the Richard T. Liddicoat Gemological Library Dedicated to G. Robert Crowningshield, Bert Krashes, & Bill Jean ODE to Gemology By a GIA On-Campus Student Dispersion, fire, aventurescence, Orient, sheen, or iridescence— Refractive index—high or low— The luster should indicate that, you know. Polarization—double or single— What to do now! They intermingle! Pleochroic colors you really should see; Was that only two, or actually three? Birefringence should help you a lot— ...
A smidgen of history, a dash of culture - a minute dedicated to making you smile.