Emerald-cut diamond cutting parameters for light performance
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Solution Overview
Problem
Existing emerald-cut diamond cutting methods often prioritize stone weight over light performance, making it difficult to achieve excellent or ideal light performance grades, as the available parameters result in limited flexibility and precision in selecting facet angles, leading to isolated 0-grade combinations on light performance maps.
Innovation Solution
The introduction of specific parameters such as a length-to-width ratio of 1.35 to 1.40, corner ratio of 13.5 to 14.5%, table width of 55 to 60%, and adjustable crown and pavilion main facet angles within defined ranges, allowing for a wider range of 0-grade domains on light performance grade maps, thereby increasing flexibility and accuracy in achieving AGS grade 1 or 0 light performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If emerald-cut diamond parameters are selected to maximize stone weight, then stone weight is improved, but light performance deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the crown and pavilion main facet angles from conventional steep angles to shallower angles within specific ranges (crown: 28-45°, pavilion: 43-48°). This parameter adjustment resolves the contradiction by optimizing light performance while maintaining acceptable weight, moving away from traditional weight-maximizing parameters that produced poor light performance.
Solution Approach 2:
The patent introduces dynamic flexibility by defining ranges rather than fixed values for facet angles and other parameters. This allows cutters to adjust parameters dynamically based on the specific rough diamond characteristics while staying within the optimized parameter space that delivers both good weight retention and excellent light performance.
2Ease of manufacture
If conventional emerald-cut parameters are used, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent changes the parameter space from conventional isolated 0-grade combinations to continuous domains by adjusting crown and pavilion main angles to shallower values. This creates broader parameter ranges that are both easier to manufacture within tolerance and more likely to achieve 0-grade light performance, resolving the contradiction between ease of manufacture and precision.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and defining the optimized parameter ranges (crown breaks: 2-6°, pavilion breaks: 2-6°, table percentage: 55-60%, etc.) before the actual cutting process. This allows cutters to plan and execute the cut with greater confidence, achieving high precision without excessive difficulty.
3Reliability
If crown and pavilion main angles are selected from isolated 0-grade combinations, then light performance is improved, but adaptability deteriorates
Solution Approach 1:
The patent applies dynamics by transforming the static, isolated 0-grade angle combinations into dynamic continuous domains. The crown main angle can vary from 28-45° and pavilion main angle from 43-48°, with corresponding adjustments to break angles. This dynamic parameter space maintains 0-grade light performance while providing substantial flexibility for different rough diamond characteristics.
Solution Approach 2:
The patent adds another dimension to the parameter space by introducing multiple interrelated parameters (crown main angle, crown breaks, pavilion main angle, pavilion breaks, table percentage, depth) that work together in a multi-dimensional optimized domain. This allows adaptability across multiple parameters while maintaining light performance, rather than relying on fixed two-dimensional angle combinations.
Data Source
AI summary
Emerald-cut diamond with length/width of 1.35 to 1.40; table of 55 to 60 percent; corner ratio of 13.5 to 14.5 percent; girdle thickness up to 3 percent; crown main angle of 28 to 45 degrees; first crown break angle of 2 to 6 degrees; second crown break angle of 2 to 6 degrees; pavilion main angle of 43 to 48 degrees; first pavilion break angle of 2 to 5 degrees; and second pavilion break angle of 2 to 5 degrees. Diamonds cut in accordance with these parameters may have light performance 0-grade domains on a grade map with wide crown and pavilion mains ranges. A method cuts the diamond according to the parameters, and may include selecting crown and pavilion main angles from the map, and cutting the diamond sufficiently close to the selected cutting parameters to obtain the light performance grade of 0.