When a diamond crystal comes from the ground, the brilliance, fire, and scintillation that constitute the unique beauty of a polished diamond are still locked within it.
The way in which a diamond cutter decides to cut the diamond ultimately determines the diamond's beauty and brilliance. The cut of a diamond is made up of many elements to determine the quality of a diamond's cut. Gemological laboratories use a sophisticated measuring device to determine how well a diamond is cut.
The Sarin Proportion Analyzer is used by GIA and other gemological laboratories to analyze a diamonds proportions.
Certified-Plus Diamonds, the Home of the United States Gemological Laboratory, is equipped with a Sarin Proportion Analyzer to verify the proportions of your favorite diamond selections. Only the finest cut diamonds are selected by our Certified Gemologist-Appraisers and only these are chosen to become Droste's 'Love's Light' Diamonds.
The Sarin Proportion Analyzer accurately measures these elements of diamond cut quality:
- Length, Width & Height
- Depth Percentage
- Table Percentage
- Girdle Thickness
- Culet Size
- Crown Angle
- Crown Height
- Pavilion Angle
- Pavilion Height
- Diamond Symmetry.
Learn Why Most Diamonds Today Are Improperly Cut:
Many diamonds today are cut improperly. A flawless, colorless rough diamond crystal can be cut to very fine or ideal proportions to deliver the greatest balance of dispersion and brilliance, or it can be cut to inferior proportions which yield a diamond that displays very little brilliance but weighs slightly heavier.
Many people who buy diamonds today are unable to identify a diamond with inferior cut. Because diamond cutters have financial incentive not to remove weight from the rough diamond crystal, a great amount of diamonds sold on the market today have heavy or deep cut.
Learn To Identify the Common Deep Cut Diamonds:
Diamonds are frequently cut for weight retention rather than to produce maximum brilliance. These "under-size diamonds" often weigh more than if they were cut correctly and can therefore be sold for a larger profit.
For example: an ideal or very fine cut one carat diamond measures 6.4 to 6.5 millimeters in diameter. If you were to measure the diameters of most one carat diamonds on the market today, you would find many to measure between 5.9 and 6.3 millimeters.
These 1.00 carat, inferior cut "under-size diamonds" are no larger in diameter than ideal or fine cut diamonds which weigh 0.75 to 0.99 carats, and they exhibit significantly less brilliance. The Certified Gemologist-Appraisers at Certified-Plus Diamonds encourage you to choose a diamond that has ideal to very fine cut.
Understanding The Behavior Of Light In A Diamond:
To understand diamond cut, it helps to understand how light reacts within a diamond. When light enters a diamond or any given material it bends or refracts. The degree to which it bends is called the refractive index.
The refractive index of a diamond is 2.41, the highest of any natural transparent gem. In diamonds, the maximum angle of refraction is 24.5 degrees. This is called the critical angle. Light traveling through a diamond is reflected if it strikes a surface outside the critical angle. Light striking a surface inside the critical angle will be refracted out of a diamond. The critical angle is represented as 24.5 degree cone in the diagram.
In a well-made diamond, a high percentage of light entering through the crown starts out striking the pavilion outside the critical angle. Thus it is totally reflected to the other side of the pavilion. There it strikes outside the critical angle again, and again it is totally reflected, this time towards the crown, where it strikes within the critical angle and leaves the light traveling in directions in which it can be seen. Such controlled release of light is planned leakage. If the pavilion is too deep or too shallow, much of the light strikes inside the critical angle and leaks out the back of the stone rather than reflecting through the diamond and back through the top to the eye.
Guidelines For Ideal To Very Fine Cut In A Round Cut Diamond: (AGS 0 - 2)
The AGS uses a system that assigns a numerical grade from 0 to 10, with 0 considered the perfect ideal cut and 10 as the lowest grade. The AGS grade 0 is based on the Tolkowsky theoretical idea.
The AGS 0 ideal cut will cost slightly more and fewer ideal cut diamonds are available. Diamonds with proportions in the range of AGS 0 and 2 are considered very fine cut and provide exceptional brilliance.
Fancy Shape Cut Guidelines, Ideal To Very Fine Cut:
Because fancy shaped diamonds are not symmetrical like a round diamond, a broader range of parameters are needed in regards to proportion. It is with great care that Certified-Plus Diamonds, has compiled this information.
The standards for fancy cut diamonds shown in this diagram were determined by analyzing hundreds of diamonds in fancy shapes. Fancy diamonds that fit into the ranges described above offer the greatest amount of brilliance.
The Certified Gemologist-Appraisers carefully analyze every fancy shape diamond that is requested by our customers. Every fancy shape must display great brilliance in cut quality before the diamond is considered for shipment to you. Hundreds of diamonds have been sold by Certified-Plus Diamonds to very knowledgeable diamond buyers who expect perfect to near perfect cut. Certified-Plus Diamonds is very successful in delivering fabulous fancy cut diamonds in every shape and size.