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HCA - Defining the Beauty and Desirability of Round Brilliant Diamonds

Garry Holloway
Abstract
Introduction
Inverse Relationship
Previous Research
DiamCalc
Fire- & Ideal-Scopes
GilbertsonScope
Developing HCA
Brill, fire, scint., spread
Method
Brilliance
Fire or Dispersion
Scintillation
Spread
Summary
Table size
Girdle thickness
Fisheye
Culet
Adjustment to HCA
No Go Zone
Flawed cut grading
BIC and FIC
Seeing is believing?
Accuracy
Market values
Links & References
Holloway Cut Adviser

Garry Holloway FGAA, DipDT, JAA Appraiser

Garry Holloway left a career in geology and in 1976 established Melbourne diamond design award winning jeweller, Precious Metals.
 
In 1984 he studied the Fire Scope™ while undertaking the Gemological Association of Australia’s Diamond Diploma. This led to a long and passionate interest in the cut of diamonds.
 
After the publication of the GIA’s ‘brilliance’ report in 1998 this passion became a crusade to improve the cut quality of all diamonds.
 
Garry developed the patent pending HCA system in 2000, and released a portable Ideal-Scope in 2001. HCA has been used to grade the cut quality of more than a billion dollars of diamonds in its first year alone. Garry’s Diamond-Cut consultancy has strong alliances with leading international diamond researchers and websites. Diamond-Cut is also Australian and NZ agents for Sarin Technologies.
 

Abstract >>
 


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