Posts by Michael Cowing
Round Brilliant Cut Beauty and Light Performance Part 1
Round Brilliant Cut Beauty and Light Performance Part 1 Going back over 100 years, numerous efforts have been made to analytically prove the superiority of the small range of angles called ‘Ideal’. Several metrics and methods have been developed in attempts to provide this proof. Ray tracing was employed by many (e.g. Marcel Tolkowsky…
Read MoreRound Brilliant Cut Beauty and Light Performance Part 2
Round Brilliant Cut Beauty and Light Performance Part 2 Going back over 100 years, numerous efforts have been made to analytically prove the superiority of the small range of angles called ‘Ideal’. Several metrics and methods have been developed in attempts to provide this proof. Ray tracing was employed by many (e.g. Marcel Tolkowsky in…
Read MoreDiamond’s Spectral Constellation
Discover the ‘Diamond’s Spectral Constellation’. Michael D. Cowing explains why the ‘Spectral Constellation’ is the ‘nexus’ connecting a diamond cut’s light performance and its illumination and why it is the key to understanding the occurrence of fire in a diamond when used as a gemstone optical analysis technique. Diamond’s Spectral Constellation Download and Print Article…
Read MoreHistory and Utility of Gemstone Reflection Pattern Generation and Analysis
A contribution to knowledge in the field of diamond and gem optics, faceting, and design. It is a contribution to the World Gem Foundation’s quarterly journal, ‘Gemmology Today’. The whole journal issue is a free download. Geoff Dominy, World Gem Foundation: I feel very fortunate to know Michael Cowing. He has a brilliant mind.…
Read MoreGem Faceting Design Discoveries
Many discoveries await in this work written for the twin worlds of ‘Diamond Cutting’ and ‘Gemstone Faceting’. Discover the attributes and properties of the most beautiful round brilliant diamond cut, the Ideal Round Brilliant, and the reasons it possesses the best optical light performance. Discover that those properties also result in the best beauty and…
Read MoreGem Faceting Design Discoveries Abbrev in ‘Gemmology Today’
Many discoveries await in this work written for the twin worlds of ‘Diamond Cutting’ and ‘Gemstone Faceting’. Discover the attributes and properties of the most beautiful round brilliant diamond cut, the Ideal Round Brilliant, and the reasons it possesses the best optical light performance. Discover that those properties also result in the best beauty and…
Read MoreDescribing Diamond Beauty and Light Performance
The full text of the article is available here.
Read MoreObjective Diamond Clarity Grading AI
The Objective Diamond Clarity system is a form of Artificial Intelligence, (AI is the capability of computer algorithms to imitate intelligent human behavior. Merriam-Webster’s Dictionary) This AI System is comprised of largely objective metrics that imitate the techniques of expert graders, whose proficiency was obtained from extensive experience and practice.…
Read MoreObjective Diamond Clarity Grading
The diamond clarity grading scale used worldwide today was introduced by the Gemological Institute of America (GIA) in 1953. To help address varying interpretations and inconsistencies in clarity grading between laboratories (and even within some labs), this article introduces an objective system for diamond clarity grading. The determination of the clarity grade is influenced by…
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