Shallow Pavilion Diamond Cut for Higher Yield Without Fish Eye
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Solution Overview
Problem
Existing round and fancy cut diamonds suffer from high weight loss during cutting and polishing due to tall crown heights and steep pavilion angles, making 'flat stones' unmarketable and increasing production costs, while traditional cuts compromise on optical quality to avoid the 'fish eye' effect.
Innovation Solution
Shallow pavilion angle cuts with specific crown and pavilion angles, combined with a pointed culet, enhance light reflection and reduce weight loss, allowing 'flat stones' to be efficiently cut into high-quality diamonds with improved sparkle and light amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional steep pavilion angles and tall crown heights are used to avoid the 'fish eye' effect, then optical quality is improved, but weight loss during cutting and polishing increases
Solution Approach 1:
The patent applies parameter changes by modifying the pavilion angle from the traditional steep angle (greater than 40 degrees) to a shallower angle (30-38 degrees), and adjusting the crown height ratio from 13-16% to 16-18%. These parameter changes resolve the contradiction by achieving equivalent or superior optical quality without the traditional weight loss, as the shallower pavilion angle reduces material removal while the increased crown height ratio maintains light reflection properties.
Solution Approach 2:
The patent inverts the traditional approach by using a shallower pavilion angle instead of a steeper one. Conventionally, steep pavilion angles were believed necessary to prevent the 'fish eye' effect, but this patent reverses that assumption by demonstrating that shallower angles (30-38 degrees) combined with increased crown height ratios can achieve the same optical quality with reduced weight loss.
2Productivity
If shallow pavilion angle cuts are used to reduce weight loss, then cut weight yield is improved, but optical characteristics may deteriorate due to the 'fish eye' effect
Solution Approach 1:
The patent uses parameter changes to resolve this contradiction by precisely controlling the pavilion angle within 30-38 degrees and the crown height ratio within 16-18%. These specific parameter ranges optimize both cut weight yield and optical characteristics, preventing the 'fish eye' effect while maximizing material utilization. The pointed culet geometry further refines light reflection to maintain optical quality.
Solution Approach 2:
The patent applies local quality by optimizing specific regions of the diamond: the crown portion is enhanced with a increased height ratio (16-18%) to improve light reflection, while the pavilion portion uses a shallower angle (30-38 degrees) to reduce weight loss. The pointed culet at the bottom provides localized light focusing that prevents the 'fish eye' effect, allowing each region to contribute optimally to both yield and optical quality.
3Reliability
If traditional round brilliant cut parameters are used, then optical quality is maintained, but girdle diameter to stone weight ratio is reduced
Solution Approach 1:
The patent applies parameter changes by increasing the crown height ratio from 13-16% to 16-18% and adjusting the pavilion angle to 30-38 degrees. These changes create a shallower overall stone profile that increases the girdle diameter relative to the stone weight, giving the visual appearance of a larger stone while maintaining optical quality through the optimized crown and pavilion geometry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shallow pavilion angle cuts achieve equivalent or superior optical characteristics to traditional cuts with reduced weight loss, providing a larger visual impression and higher yield, thus reducing production costs and enhancing diamond quality.
Implementation Method 1
A pavilion surface extends at a pavilion angle relative to the table... enhance light reflection and reduce weight loss
Data Source
AI summary
The invention is directed to shallow pavilion, cut diamonds having excellent optical characteristics. The pavilion surface includes a plurality of substantially planar main pavilion facets, each of which extend from the girdle to a pointed culet defining the bottom most portion of the cut diamond. The crown angle is in the range of between about 29 degrees to about 36 degrees, and the pavilion angle is in the range of between about 15 degrees and about 34.5 degrees. The shallow pavilion, cut diamonds of the invention may be either round shaped cut diamonds or fancy shaped cut diamonds.