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GemWise: Pigeon's Blood ruby

GemWise: Gonzo Journalism for gem and Jewelry lovers. About once a
month on one of the gem forums someone asks the question:

“What color is pigeon’s blood.”

by Richard W. Wise, G.G. [c] 2007

The real question is, of course, "what is the best color in ruby."
Although I cover the question in some depth in my book; Secrets of
The Gem Trade, The Connoisseur’s Guide to Precious Gemstones, it
appears that a few people have yet to read the book. (pictured above
a gem quality 2.09 carat natural old mine Burma ruby with a GRS
"pigeon’s blood certificate)

The short answer is simply that rubies should be red. Problem is
there are almost no visually pure color in nature so, we speak of a
mixture of colors. In gems, we normally speak of a primary and a
secondary color or hue. Gems may have more than two hues but it it is
difficult for even the most discerning connoisseur to see more than
two. Still a ruby must be predominantly red, that is, have a primary
red hue. Put another way in the color mix, red must be at least 51%
of the hue mixture. If its not red its not a ruby. Any member of the
gem family corundum that is any color other than red we call

Ruby may exhibit one of a few possible secondary hues. These aRe:
pink, purple and orange. Purple and orange are the hues immediately
adjacent to red on the color wheel. You will never find a ruby with a
green secondary hue. Pink, a paler less saturated red is also
possible. The finest color or pigeon’s blood exhibits a purple
secondary hue. Why purple, there are two good reasons; one historical
and the other based upon color science.

This historical explanation I owe to Vincent Pardieu. Vincent began
by studying gemology in Burma and he found a dealer who explained
"pigeon blood" to him. The Burmese coined the term. Purple is a hue
that falls between blue and red on the color wheel. It is known
scientifically as a modified spectral hue. The Burmese set gems in
pure gold which is a a very rich yellow color. Blue is the
compliment of red. Complimentary colors are those that cancel each
other out. So when a purplish red ruby is set in yellow, the yellow
of the metal cancels out the blue in the purple leaving behind, guess
what an almost visually pure red.(pictured above a 1.63 carat gem
quality old mine Burma ruby with a GRS "pigeon’s blood certificate).
So the goal for the Burmese is red, pure red!

I wrote my book several years before I met Vincent in Bangkok.
However, I reached the same conclusion by applying a logical
analysis. My reasoning goes something like this. Color Science
teaches that the color red reaches its optimum saturation
(brightness) at a fairly dark tone, somewhere about 80%. This is not
opinion, it is measurable scientific fact. If you consider that 100%
tone would be pure black, 80% is pretty dark. Pink and orange on the
other hand reach their optimum saturation at fairly light tones.
Pink obviously as it is by definition paler (less bright). Orange
reaches its optimum saturation at between 30-40% tone.

Purple reaches its optimum saturation at around 60% tone. Now, if
you add a light pigment to a dark paint you would obviously lighten
the overall effect. Same is true in transparent media. The optimum
tones of red and purple mix fairly well both being both dark in tone.
The purple unlike the pink does not dilute the red. Pink and orange
would lighten the red thus reducing the overall saturation of the
pinkish-red or orangy-red color. Purple reinforces the red, orange
and pink dilute. Make sense? Not everyone agrees. Some connoisseurs
like a bit or orange. They feel it frames and pumps up the red hue.
A good point if you consider the effect of orange in red spinel. Be
that as it may, for good historical as well as scientifically
verifiable reasons, orangy red is not pigeon’s blood.

The first image above is of a 2.09 carat Burmese natural ruby from
the old min at Mogok. This stone has a bit purer red, exhibits less
purple than the second stone, a 1.63 carat gem from the same mining
area. Both, however, have been grading “Pigeon’s blood” by GRS,
Swiss Lab, Bangkok. As you might imagine this lab sees an awful lot
of rubies. Both stones are from the Mogok Valley, this is the place,
going back to the Bronze Age, where the original stones were mined
back when the term pigeon’s blood was coined. A lot of the gems
currently in the market are from a new mining areas Mong Hsu that is
about half way between Mogok and the Thai border. Mong Hsu stones
can certainly be pigeon’s blood color but since we are talking about
a historical term I thought it best to use illustrations from the old

Secrets Of The Gem Trade