Title: Distinguished Research Fellow, Carlsbad, California USA
Areas of Expertise: Gem identification; synthetic and treated diamond identification; gemology and mineralogy of colored stones
Selected Published Research:
- The Geographic Origin Dilemma, Gems & Gemology (2019)
- Recent Advances in the Understanding the Geology of Diamonds, Gems & Gemology (2013)
- Grading “D-to-Z” Diamonds at the GIA Laboratory, Gems & Gemology (2008)
- A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds, Gems & Gemology (2004)
- Color Grading of Colored Diamonds in the GIA Gem Trade Laboratory, Gems & Gemology (1994)
- The Gemological Properties of the Sumitomo Gem–Quality Synthetic Yellow Diamonds, Gems & Gemology (1986)
Education:
- Bachelor of Science in Geology, University of California Berkeley, Berkeley, California, United States, 1971
- Ph.D. in Geology, Stanford University, Stanford, California, United States, 1982
- Thesis: Phosphate minerals from the Stewart Mine, Pala, California
- Advisors: Gordon Brown (Stanford University), Richard Jahns (Stanford University), and Richard Erd (United States Geological Survey)
Contact James Shigley
Title: Distinguished Research Fellow, Carlsbad, California USA
Areas of Expertise: Gem identification; synthetic and treated diamond identification; gemology and mineralogy of colored stones
Selected Published Research:
- The Geographic Origin Dilemma, Gems & Gemology (2019)
- Recent Advances in the Understanding the Geology of Diamonds, Gems & Gemology (2013)
- Grading “D-to-Z” Diamonds at the GIA Laboratory, Gems & Gemology (2008)
- A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds, Gems & Gemology (2004)
- Color Grading of Colored Diamonds in the GIA Gem Trade Laboratory, Gems & Gemology (1994)
- The Gemological Properties of the Sumitomo Gem–Quality Synthetic Yellow Diamonds, Gems & Gemology (1986)
Education:
- Bachelor of Science in Geology, University of California Berkeley, Berkeley, California, United States, 1971
- Ph.D. in Geology, Stanford University, Stanford, California, United States, 1982
- Thesis: Phosphate minerals from the Stewart Mine, Pala, California
- Advisors: Gordon Brown (Stanford University), Richard Jahns (Stanford University), and Richard Erd (United States Geological Survey)
Contact James Shigley
