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hofer@colourdiamondexpert.com

Articles

As a research gemologist, I have focused my entire career on the study of rare coloured diamonds. Through the years, I have published a number of articles on the subject of coloured diamonds in various diamond industry journals and magazines.  The following is a partial list of the articles I have written on this subject.

  • Fancy Colored Diamonds Proceedings of the International Gemological Symposium, 1982, Santa Monica, CA., D. Eash [Ed.], pp. 207-217
  • Diamonds with Fancy Colors: Pink, Orange, Brown, Blue, Yellow & Green, Focus on Gems: Educational Slide Series, 1982, Gemological Institute of America (GIA), Santa Monica, CA.
  • Natural Fancy Color Diamonds, Jewelers Circular Keystone, 1984, Jul., pp. 106-128
  • Pink Diamonds From Australia, Gems & Gemology, Fall, 1985, Vol. 21, No. 3, pp. 147-155
  • The Hope Diamond: A Practical Examination of the Color Using Colorimetric Methods, Unpublished Report, Feb., 1989, Colored Diamond Laboratory Services, Inc., (CDLS) New York, NY., pp. 1-9
  • Introduction to Colored Diamonds, New York Diamonds, Jun., 1988, No. 1, pp. 28, 30
  • Color Description, New York Diamonds, Sep., 1988, No. 2, pp. 78-79
  • Color Communication, New York Diamonds, Dec., 1988, No. 3, pp. 78-80
  • Common Color Names & Color Varieties, New York Diamonds, Summer, 1989, No. 5, pp. 70-72
  • Color Modifiers, Autumn, 1989, No. 6, pp. 70-72
  • Discussing Color Tone with Confidence, Winter, 1989, No. 7, pp. 68, 70, 72
  • Describing Lightness and Saturation, Spring, 1990, No. 8, pp. 70, 72
  • How Angle of Viewing Affects Perception: Color in the Face-up Direction, Summer, 1990, No. 9, pp. 74, 76
  • Interpreting Face-up Color, Autumn, 1990, No. 10, pp. 70, 72
  • Notes and New Technologies: Cutting for "Best" Face-up Color, Winter, 1990, No. 11, pp. 70, 72
  • Understanding How Light Sources Differ, Spring, 1991, No. 12, pp. 68, 70
  • The Ideal Lighting for Buying and Selling Colored Diamonds, Summer, 1991, No. 13, pp. 70, 72
  • Lighting and Viewing Conditions Affect Color Perception, Autumn, 1991, No. 14, pp. 70, 72
  • Colored Diamonds: Color Grading & Nomenclature, Les Joyaux, Tokyo, Japan, Nov. 1990, Vol. 11, No. 107, pp. 138-140; Jan. 1991, Vol. 01, No. 108, pp. 156-157; Mar. 1991, Vol. 03, No. 109, pp. 128-129; May 1991, Vol. 05, No. 110, pp. 135-137
  • Color Our World: Lighting and its Affect on Gemstone Color, Lapidary Journal, Sep., 1992, Vol. 46, No. 6, pp. 43-47, 94-96