Tag Archives: colour grading

GIA launches automated melee screening service

June 2, 2016

Gemological Institute of America (GIA) say it has developed a fully automated system to rapidly and accurately analyze and sort round D-to-Z melee-size diamonds.

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Is there a place for hue on diamond grading reports?

May 1, 2014

Over the last 90 years, some of the most prominent gemmologists and gemmological institutions have aimed to create scientific consistency. The principal goal of their endeavour has been to formalize a standardized, unbiased language to accurately describe diamonds and gemstones.

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Seeing red (and blue and green): Colour perception and light(ing)

May 1, 2014

The vivid yellow of this diamond is only in your mind…literally. Colours are a significant part of our experience as humans and a huge part of what we do as professional gemmologists and appraisers.

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Loupe it or lose it: Why training matters, even for the most veteran appraiser

December 1, 2013

Unfortunately, diamond grading is one of those experiences in which we may be hindered by our assumptions. It may be that some of those presumptions are made on an almost subconscious level.

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An alternative take on grading fancy-coloured diamonds

May 1, 2013

One in 10,000 natural diamonds has enough colour to be deemed a fancy-coloured stone. Browns are the most common, and some mines like Rio Tinto’s Argyle in Australia produce large quantities of these diamonds, which are marketed as ‘champagne’ in the lighter yellowish brown range and ‘cognac’ for the darker orangey brown variety.

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How experience and close observation can save you money

February 1, 2013

Experience and keen perception are a must in the jewellery industry. Since the scale of the object is most often very small, this is a good place to start training the eyes to see things that can truly make a difference in value and price.

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Coping with diamond-grading discrepancies: What the H?!

August 1, 2012

As an independent appraiser who neither buys nor sells diamonds, I often have to explain why my grades are substantially different from those provided by a client’s grading report from one of the many laboratories. Inevitably, the client wants to know how something like this can happen. Come to think of it, aren’t we all a bit curious?

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Grading system developed for opal

June 6, 2011

A new opal grading system aimed at restoring confidence and transparency for the trade and consumers debuted at the Gemological Institute of America’s (GIA’s) Symposium last month.

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