Diamonds

ACA Gemological Laboratory.

Identify the Ideal by the Eye of the Diamond

Here is a surefire way to recognize Ideal cut diamonds at a glance. Learn to look for the “eye of ...
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Ideal Cut

The Ideal Brilliant Cut: Its Beginnings to Today Introduction Since its beginnings in the early 20th century to the present ...
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ACA Gemological Laboratory.

What is the American Ideal Cut?

Question: What exactly is the American Ideal? Was it Americans who refined the cutting/proportioning process? The American Ideal Cut Ideal ...
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ACA Gemological Laboratory.

The Central Ideal

Have you heard of the ‘American Ideal’ or ‘Tolkowsky Ideal’ in diamond cutting? How about the ‘Morse Ideal’? Michael Cowing explains ...
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The Accord in Round Brilliant Diamond Cutting

Photo realistic image of today’s Ideal cut diamond Photo realistic image of the Ideal with pavilion cut in the antique ...
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The Overgrading of Blue-Fluorescent Diamonds

Michael D. Cowing FGA AGA Certified Gem Laboratory email: michaelgem@gmail.com Abstract: Decades after the establishment in the mid-twentieth century of ultraviolet-free ...
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Over Grading of Blue Fluorescent Diamonds Revisited

Nineteen years ago GIA published the results of a human experiment in the observation of diamonds with various amounts of ...
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ACA Gemological Laboratory.

A Place for CZ Masters in Diamond Colour Grading

Figure 2. Complete set of GIA graded diamond masters from E through M. Over the last 20 years and despite ...
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Diamond Design and Light Performance 101

Diamond Design and Light Performance Analysis 101 . A brilliant cut diamond’s appearance is a kaleidoscopic pattern of many internal ...
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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 ...
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