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Last Name. Red diamonds are so rare that between and , no diamonds with a pure red color were graded by the Gemological Institute of America.
The Argyle Mine, the leading producer of red diamonds, came online in December of , and that is when a few red diamonds per year started appearing at the GIA laboratory.
Slightly less rare are diamonds with a modified red color. Modifying colors include brown, purple, and orange.
These produce diamonds that are brownish red, purplish red, and orangy red. The diamond market may have an even more limited number of new red stones entering the market, because the Argyle Mine is expected to close in At present, no new sources of even occasional red diamonds are known.
Cause of Color in Red Diamond: In this photomicrograph, you are looking into the interior of a rough diamond through a small polished window on its surface.
The pink vertical lines are "graining" caused by plastic deformation of the diamond crystal lattice. Each pink line traces a glide plane within the diamond where carbon atoms have been displaced.
In this view, the glide planes intersect the polished window at a right angle. Each glide plane is a defect in the diamond that causes the diamond to selectively absorb green light and selectively transmit red.
Note the tiny offsets where the slip planes intersect the edges of the polished window. The Argyle mine is located in an area of Australia that was subjected to the compressive forces of the Proterozoic Halls Creek Orogen.
About 1. These forces are thought to be responsible for dislocating carbon atoms in many of Argyle's diamonds. The high temperatures and shear stress of the plate tectonics are thought to have resulted in plastic deformation in the diamonds.
The deformation is a slight displacement of carbon atoms along glide planes parallel to the octahedral direction of the crystal.
These planes of displacement influence how light passes through the diamond and can cause the selective absorption or selective transmission of certain wavelengths of light.
Most often, these glide planes cause a selective transmission that produces brown diamonds. Less often, the glide planes cause the selective transmission of red light.
When there are few glide planes, a small amount of red light transmission produces an apparent pink color of the diamond. Light red diamonds are called "pink" diamonds during grading.
Fancy Vivid pinks might appear to be "red" to many observers; however, the strict rules of color grading designate them as "pink".
Only in very rare situations are enough glide planes present to produce a more intense saturation of color, resulting in a rare and wonderful Fancy red diamond.
Many people do not realize that pink diamonds and red diamonds both have a red color. The difference between "red diamonds" and "pink diamonds" is one of color intensity.
During the color grading process, a diamond with a weak to moderate saturation, accompanied by a light to medium tone, will be called a "pink" diamond.
The name "red" is reserved for diamonds with a strong color saturation and a medium to dark tone. The name "Fancy red" is given only to those diamonds that exceed the saturation levels of Fancy Vivid pink and Fancy Deep pink.
Many people who are unfamiliar with the procedures used to grade colored diamonds would, at a glance, call a diamond with a very light red color a "pink diamond".
Most humans have been conditioned since childhood to use the name pink for objects that have a very light red color.
Many of those same people would, at a glance, think that a Fancy Vivid pink or a Fancy Deep pink was a "red diamond".
The grading is stricter than many people expect. The best way to comprehend this is to study the color reference charts for colored diamonds published by the Gemological Institute of America.
In the colored diamond grading system, the name "red" is used so sparingly that only a very few diamonds have an intensity of red color that is able to earn it.
A person could hold the opinion that the rarity of red diamonds is more a matter of "grading" than a matter of "color". A similar use of "red" and "pink" in gemology is in the grading of gem corundum.
Corundum with a vivid red color is called " ruby ", while corundum with a light red color is called " pink sapphire " or " fancy sapphire ".
The difference in price between a "ruby" and a "pink sapphire" can be significant. As a result, submitting a gem for grading can be accompanied by anticipation and apprehension.
Cutting a Red Diamond: Red diamonds are often cut with their tables parallel to the color-producing glide planes.
This can produce a diamond with a richer and more uniform color when viewed in the face-up position. To maximize the amount of red light transmission, red diamonds are often cut with their tables parallel to the color-producing glide planes.
This maximizes the amount of light intersecting the glide planes as rays of light descend through the table and down into the diamond. Much of this light reflects from pavilion facets and travels back up toward the table, passing through those same glide planes a second time to accumulate more color.
The work of the person who plans and executes the cutting of these diamonds is very important. Proper planning and cutting is important for all colored diamonds, but it is especially important when cutting red.
Proper cutting can produce a more saturated and even color when the diamond is viewed in the face-up position.
One of the first colored diamonds to grab newspaper headlines was the Hancock Red. The Hancock Red had been around for a while.
It was cut from Brazilian rough, and one of its first owners was Mr. Warren Hancock, a Montana rancher who was also a collector of colored diamonds.
At that time very few people were interested in colored diamonds, and most people had never thought about them. Hancock's death. Hancock's estate.
The spectacular price brought enormous media and celebrity attention to colored diamonds.