An Exciting New Instrument Lets You Clearly Assess the Optical Qualities of Any Diamond
No one would knowingly purchase an ugly diamond. In the final analysis, all that anyone purchasing a diamond wants is a stone that makes them happy - a beautiful stone of the quality they desire at a good price. They will do any or all of the following in order to reach a certain level of satisfaction on the beauty of the diamond before going forward to purchase a stone:
Listen to the input from the salesperson
Compare different rings side by side
Compare loose unset diamonds side by side
Purchase from a reputable high end retailer like Tiffany’s
Purchase a branded diamond such as Hearts on Fire or Eight Star, among others
Learn all that they can about the 4C’s of diamond grading: Color, Clarity, Carat Weight and Cut
Limit the choices to diamonds with GIA or AGS grading reports
Choose stones with GIA reports with the grades for Polish, Symmetry and Cut all “Excellent”
Choose stones with AGS reports with the Polish, Symmetry and Light Performance all “Ideal”
View their possible choices under a Firescope or Ideal Scope
Some of these actions are in filtering out the top stones for one to choose from. Is there more? How would one know just how a particular diamond fares on the four qualities that together reveal the beauty of a diamond? These qualities are:
Light loss
Light entering a diamond can be lost out the bottom or the sides of the stone. Light loss should be minimal.
Brilliance (light returned to the eye as white light)
Brilliance should be high but balanced with Dispersion. Brilliance has two components. These are brightness and pattern/contrast. Brightness is self evident. Pattern is the arrangement of light and dark areas that come from internal and external reflections. Contrast is the relief of light and dark areas that creates the face up pattern of a diamond. Symmetric contrast and optical symmetry are important for Scintillation.
Dispersion (light returned to the eye as flashes of rainbow color or "fire")
Dispersion should be high but balanced with Brilliance. Brilliance and Dispersion are somewhat inversely related. That is, when a diamond is cut to increase Brilliance it will lose some Dispersion. Conversely, when a diamond is cut to increase Dispersion it will lose some Brilliance. The diamonds with the best cuts have a nice balance of white light and flashes of rainbow color.
Scintillation
This is the intense sparkles from the small areas of light that flash on or off as the diamond, the observer or lighting moves. Symmetric contrast and optical symmetry, for example, the Hearts and Arrows patterns, are needed for high scintillation.
One newly developed instrument, the Diamond Photoscope, can give clear and repeatable feedback on these four optical qualities for any diamond. This is a proprietary instrument that has taken years to develop. The Diamond Photoscope captures the light returned by any diamond and generates highly accentuated images of light loss, brilliance, dispersion, scintillation (optical symmetry and symmetric contrast). A composite image is also generated. It is many times easier to see and assess these qualities from the Diamond Photoscope images than by just viewing the stones themselves.
Here are some examples:
We would draw the following conclusions about each stone based on the Photoscope images. The characteristics indicated by the Photoscope images can actually be seen in each stone.
0.90 ct Round Brilliant Cut H VS2
Some amount of light lost through the bottom of the stone
Little light lost through the sides of the stone
Strong brightness
Strong pattern
Strong contrast
Strong optical symmetry
Strong dispersion
Strong brilliance
1.01 ct Round Brilliant Cut G VS1
Some amount of light lost through the bottom of the stone
Some amount of light lost through the sides of the stone, especially near the center of the stone
Relatively strong brightness
Weak pattern
Weak contrast
Weak optical symmetry
High dispersion
Relatively strong brilliance
1.03 ct Princess Cut G SI2
Low level of light lost through the bottom of the stone
Some light lost through the sides of the stone
High dispersion
High brilliance
Medium contrast
Strong pattern
Relatively strong optical symmetry
1.02 ct Princess Cut F VVS1
Large amount of light lost through the bottom of the stone
Fairly large amount of light lost through the sides of the stone
Low level of dispersion
Low level of brightness
Low level of brilliance
Poor contrast
No clear pattern
Low level of optical symmetry
The Diamond Photoscope can help you to further assess and understand the optical qualities of the stones that you are considering for purchase. If you want a Super Ideal Cut round brilliant diamond it can let you see what the optical differences are between several Super Ideal Cut stones. If you want a fancy shape diamond (Princess Cut, Cushion Cut, Marquise, etc.) it can show which stones have the least light loss and the most brilliance, dispersion and scintillation
As always, we welcome your thoughts and comments.
