"Levels of Confidence" A pre-purchase, screening tool for the consumer. An explanation tool for the appraiser. Intended to gauge the credibility of represented color, clarity and cut grades compared to GIA or AGSL grading. Highest Confidence: SCORE = 1 The grade will exactly match GIA/AGS 65% to 70% of the time. ...
A screening tool for all diamond grading CLICK HERE TO VIEW POST
Many of us know Al Gilbertson as an esteemed cutter, gemologist and innovator. Add "mythbuster" to his titles. Mr. Gilbertson has produced a gem of a book, sure to be a page-turner for enthusiasts of "ideal" diamond cutting origins. "American Cut - The First 100 Years" documents important changes between 1850 and...
“American Cut – The First 100 Years,” by Al Gilbertson, G.G. CLICK HERE TO VIEW POST
The problem started back in 1812 when Friedrich Mos developed the Mohs scale for gemstone hardness. He took a selection of stones and used them to scratch each other. Harder stones would scratch softer ones and he organized them into a ranking from 1 – 10 with diamond being the hardest. Nothing will scratch a diamon...
What do you mean diamonds can chip?! CLICK HERE TO VIEW POST
GIA's letter to the Editor This journal article documents letters to the Editor exchanged between the GIA cut study team and the cut group who wrote an article in The Australian Gemmologist The original article from Volume 23, Number 1, January – March 2007 is not reprinted here, but a similar article was po...
Letter to the Editor of the Australian Gemmologist CLICK HERE TO VIEW POST
David S. Atlas 2/10/2007 I love fine gems, well cut diamonds and quality jewelry. Please don’t shoot the messenger, as I have bought, sold, owned and appraised countless millions of dollars worth of these beautiful things since 1967 when I entered the jewelry trade. I’ve been fortunate to have made a decent liv...
Fine jewelry settings are created from precious metals. This article addresses some important information about gold, white gold, rhodium plating and nickel allergies, as well as covering fine distinctions between common platinum alloys. Many alloys exist and new ones are constantly being developed. Here is an overv...
An Overview Of Common Alloys Used In Jewelry CLICK HERE TO VIEW POST
This article shows an interesting effect of dispersion whereby color components are progressively diverted from the spectrum, as in 'fractional distillation' or 'fractional crystallization' of liquids. White Light & Rays White light is composed of combined colors; different colors can be combine...
With grateful acknowledgment to John Pollard, Sergey Sivovolenko, AGSL and GIA Laboratories for valuable resources and input. Graphics produced with DiamCalc software by OctoNus. Note: This article pertains only to 'superideal' diamonds, meaning those with commonly agreed 'ideal' proportions and a high level of o...
Visible Effects of Painting & Digging on Superideal Diamonds CLICK HERE TO VIEW POST
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