Proportion Analysis
Work is done on the raw material to produce a specific number of facets in accordance with a specified geometrical arrangement that matches the cut style.
Facet angles must be exact and adhere to optical principles that specify a certain angle based on the material and its unique refractive light index.
We may indeed conclude that, in order to acquire a gemstone that performs stunning light tricks, the inclination imparted to distinct facets in the cut is of the vital important.
By measuring the gemstone proportions, it is possible to verify that the laws of optics and facets' angles are being applied correctly.
Numerous calculations and measurements are used to analyze the proportions for the gemological certificate.
"A visual estimation might provide extremely helpful characteristics for its assessment."
The crown height to pavilion depth ratio is one technique by crown height / pavilion depth.
You may determine the proportion between the height of the crown and the depth of the pavilion by examining the gemstone's appearance with your naked eyes and ignoring the thickness of the girdle.
The ratio is ideal if it falls between 1/3 and 2/3 or between 1/4 and 3/4. Otherwise, it differs from the recommended ratios, which might degrade the cut's quality.
The following aesthetic elements may also have an impact on how cut proportions are evaluated:
Swelling: A "pot-bellied" look that is frequently seen in stepwise cuts
Girdle thickness: unattractive girdles are those that are either too thin or excessively thick.
Symmetry Analysis
The symmetry of a gemstone assesses how cut components like facets, culets, and mirroring are positioned between the two sides of the gemstone.
These asymmetries may more or less be seen by completing a visual study of the gemstone. Additionally, the symmetry analysis has an impact on how well the cut was evaluated.
Based on the presence and appearance of symmetry deviations at a 10x magnification, symmetry is rated from Excellent to Poor.
Polishing Analysis
“Polishing” means polishing of the gemstone’s facets. The evaluation of the gemstone may be impacted by the presence of nicks and grooves.
Re-polishing may be done to enhance the brilliance and get rid of flaws, which is why it could be thought of as less important than other qualities.
A cavity or significant indentation cannot be eliminated by polishing; instead, the gemstone must be recut. As in the previous analysis, the various aspects of polishing can be rated from 1 to 5.
Brilliance
The brilliance is the final, most crucial quality to consider when analyzing the cut since it shows how all the previously examined factors interact with one another.
The quantity of light that a gemstone can transmit to the eye of the observer is known as brilliance. The internal refraction and reflection of penetrating rays, which are directed in their optical path by the angle of the facets and reflect through the crown, produce the light that is emitted from the gem.
A perfect cut enables complete interior reflection, as a result, the crown's maximal light emission.
When examining a gem, the window effect and extinction are two phenomena that reduce brightness; both are related to an imperfect cut.
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