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Garry Holloway FGAA, DipDT, JAA Appraiser, 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 diamond cut. After the publication of the Gemological Institute of America's ”˜brilliance”™ report in 1998 this passion became a crusade to improve the cut quality of all diamonds. Garry developed the Holloway Cut Adviser (HCA) system in 2000, and released a portable Ideal-Scope in 2001. In 2004 he was a speaker at the 1st International Diamond Cut Conference (IDCC) in Moscow, Russia. The HCA was used to grade the cut quality of more than a billion dollars of diamonds in its first year alone. Holloway's HCA patent was granted on July 31, 2007. His diamond-cut consultancy has strong alliances with leading international diamond researchers and websites.
Last 5 articles of this author
Making the Grade – GIA Cut Grading
Has the GIA’s cut grading system for round brilliant diamonds made lower cut grades
redundant?
(left) Polish lines seen through the table - (right) Actual lines on the pavilion girdle facetImages courtesy of the Russian Gemmological Centerclick here to see a larger version
In 2006 the Gemological Institute of...
India: International Distribution Problems
The Internet has bought the world a click away. Shoppers are now offered a huge number of diamond and jewelry options from different parts of the world. A lot more information and the specifications are available today and price and quality comparisons can be made thanks to our consumer advocate website Pricescope.c...
Diamond Grading Labs – A Plan for Peer Review
Labs grading mistakes are a diamantaires favorite topic of conversation; are mistakes myths or reality? We aim to find out.
If major labs give the same diamond 2 or more grade differences, this is more than a borderline difference of opinion. We want your help to find examples (like this one).
We will send ston...
GIA Excellent Cut Grade: Case Study
Introduction
At the start of 2006 GIA began, for the first time ever, issuing cut grades for round colorless diamonds. Evidence suggests this system, that was meant to help, could actually disadvantage many retailers and consumers.
Background
GIA began a computer ray tracing Cut Study in 1989. In 2001...
Making the Grade – GIA Cut Grading
Has the GIA’s cut grading system for round brilliant diamonds made lower cut grades redundant? (left) Polish lines seen through the table - (right) Actual lines on the pavilion girdle facetImages courtesy of the Russian Gemmological Centerclick here to see a larger version In 2006 the Gemological Institute of...
India: International Distribution Problems
The Internet has bought the world a click away. Shoppers are now offered a huge number of diamond and jewelry options from different parts of the world. A lot more information and the specifications are available today and price and quality comparisons can be made thanks to our consumer advocate website Pricescope.c...
Diamond Grading Labs – A Plan for Peer Review
Labs grading mistakes are a diamantaires favorite topic of conversation; are mistakes myths or reality? We aim to find out. If major labs give the same diamond 2 or more grade differences, this is more than a borderline difference of opinion. We want your help to find examples (like this one). We will send ston...
GIA Excellent Cut Grade: Case Study
Introduction At the start of 2006 GIA began, for the first time ever, issuing cut grades for round colorless diamonds. Evidence suggests this system, that was meant to help, could actually disadvantage many retailers and consumers. Background GIA began a computer ray tracing Cut Study in 1989. In 2001...
