WHAT IS IDEALSCOPE

Based on an early invention by professor Kazumi Okuda from the 1970s, the IdealScope is a tool that evaluates a diamond’s cut using colored reflectors. It is basically a 10x magnifying lens with red-reflecting material, between which a diamond is placed. It contains a viewing hole in the center so that an observer can look in and see just how much red or pink is refracted from the stone. Other colors that you may see while observing a stone through the Ideal Scope are black and white, indicative of blocked or leaked light.

So let's go through this THOROUGHLY!

  • Red - The color you want to see because it means your stone is intense with passion… and also that light is being optimally reflected. (Measured at an angle of 0-75 degrees)

  • Pink - Still indicates light reflection, but a less intense or less optimal amount

  • White - The no Bueno of colors, as it is an indication of light leakage. You want to see less white overall, but there are some acceptable cases when stones emit white “contrast leakage.”

  • Black - Areas where light is blocked by the observer or the camera (Measured at an angle of 75-90 degrees)

The best use of Ideal Scope is in analyzing the optical symmetry of a diamond.

Here's an example of a well-cut diamond with some contrast leakage:

Contrast leakage around the perimeter of a diamond can contribute to its visual appearance by subtly enhancing brightness, fire and scintillation.

 

 

ADVANTAGES AND DISADVANTAGES OF USING IDEALSCOPE

ADVANTAGES
  • Can easily evaluate your inventory of round brilliants based on light performance

  • Great tool for assessing brilliance and symmetry

  • Very simple to use and interpret; does not require extensive knowledge to understand what you are seeing

DISADVANTAGES
  • Does not work well in assessing fancy shapes

  • Reduced performance in darker colored stones

  • Needs backlighting to get the best image

"DIFFERENCE BETWEEN ASET AND IDEALSCOPE"?

ASET: ANGULAR SPECTRUM EVALUATION TOOL

WHAT IS ASET?

ASET was developed by The American Gem Society (AGS) as a means for evaluating a diamond’s interaction with light. It is the only diamond cut grading tool endorsed by the scientific community, as it critically examines a stone's optics by 3-dimensionally evaluating light performance in all 58 facets.

HOW DOES IT WORK?

First a little background: When light passes through the table of a diamond, it is broken down into a rainbow spectrum of colors. Once in, these colors are temporarily trapped, causing them to bounce around several times from facet to facet, generating sparkle. When the light finally has an opportunity to refract out, it can leave through the table as white light, which is what we see as brilliance; or it can leave as separate rays, which reach our eyes in flashes of color.

Keeping the physics of light play in mind, ASET generates a color-coded image that identifies the angle from which a diamond is gathering its light, allowing us to see how well or how poorly the diamond is handling the rays. (Stout, P. (n.d.). The American Gem Society An Introduction to ASET ® Theory & Technology. 

WHAT COLORS ARE USED IN THE CODED IMAGE?

Red: Captures the brightest reflected, represents brilliance. (Strikes the diamond from 45 to 75 degrees to the table)

Green: Captures light that is not as bright; reflected off of indirect angles (Strikes diamond from 0 to 45 degrees)

Blue: Represents contrast; created by light that could have entered the diamond, but was blocked by the observers head (Strikes at 75 to 90 degrees)

Black/White: Both colors represent leakage- or an area from which light is lost.

LEARN MORE ABOUT EACH SHAPE'S ASET READING

  • ROUND

  • PRINCESS

  • EMERALD

  • ASSCHER

  • MARQUISE

  • OVAL

  • RADIANT

  • PEAR

  • HEART

  • CUSHION

TYPES OF ASET IMAGES:

There are two types of ASET images:

  • Actual images are seen through a device: detailed, three-dimensional

  • Computer-generated images: simplified, idealized and two-dimensional

TIPS FOR EVALUATION

Ideally, you want to see more red than green in a stone; with the exception of the reflection area in the very center of the stone, which can be red, green or a combo of both. Blue should be distributed in a balanced and symmetrical manner because it shows us the pattern of light and dark areas that makes a stone visually pleasing. Since black and white represent light leakage, you should really see very little of these colors. In fancy stones, expect to see more green. 

USING ASET TECHNOLOGY

ADVANTAGES
  • Is not limited to round brilliants; it works with all fancies

  • The technology works with both loose and mounted diamonds

  • Can easily evaluate your inventory and select diamonds based on light performance

  • Eliminates any ambiguity regarding a diamond’s cut

  • Does not require backlighting to generate a good visual of the stone

DISADVANTAGES
  • Requires more knowledge to decipher what individual colors mean and how they relate to a stone’s optics

LIGHT PERFORMANCE RATING

ASET images of stones can be rated on a scale of 0-10

  • 0-2 indicates HIGH PERFORMANCE, with 0 limited to being “AGS Ideal”

  • 3-7 indicates MEDIUM PERFORMANCE

  • 8-10 indicates LOW PERFORMANCE

ASET REPORT

An ASET report should be able to tell you about a stone’s

  • Light Performance: Optical Efficiency

  • Optical Symmetry

  • Physical Symmetry

  • The Cutters Expertise

A well-cut stone will reflect most of the light striking it, appearing bright and beautiful! But a low-quality stone leaks most of the light and looks dimmer to the observer.

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Diamond and Jewelry Buyer