Oblong Diamond Facet Angles for Brilliance
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Solution Overview
Problem
Emerald and cushion cut diamonds lack the brilliance and light reflection characteristic of round brilliant cuts, and existing efforts to enhance light amplification in oblong gemstones have been unsuccessful in achieving desired results with fewer facets.
Innovation Solution
An oblong precious stone design featuring specific angles for crown and pavilion facets, along with an unconventional girdle height percentage, to enhance light amplification, including a table facet with elongated sides and a unique arrangement of crown and pavilion facets, which results in increased light reflection and a brilliance effect similar to round brilliant cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional emerald cut parameters are used (crown angle 35-36°, pavilion angle 40-41.5°, total depth 60-70%), then the diamond maintains traditional emerald cut proportions, but the brilliance and light reflection are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the crown angle to 28-33° (from conventional 35-36°), pavilion angle to 31-36° (from conventional 40-41.5°), and girdle height to 2.5-5.0% (from conventional 0-2.0%). These parameter adjustments optimize light reflection and brilliance while maintaining the emerald cut's elegant appearance with fewer facets
Solution Approach 2:
The patent introduces asymmetry through the unconventional girdle height (2.5-5.0% versus conventional 0-2.0%) and the specific asymmetric arrangement of crown and pavilion facets. This asymmetric design creates unique light paths that enhance brilliance while reducing the total number of facets required
2Productivity
If the number of facets is reduced to lower carat weight and cost, then manufacturing efficiency improves, but light amplification and brilliance are typically compromised
Solution Approach 1:
By changing critical parameters (crown angle to 28-33°, pavilion angle to 31-36°, girdle height to 2.5-5.0%), the patent achieves optimal light reflection with fewer facets, resolving the contradiction between manufacturing efficiency and light amplification
Solution Approach 2:
The patent applies local quality by concentrating facet arrangement optimization in specific zones (crown and pavilion angles) rather than uniformly across all facets. This localized optimization enables fewer total facets while maintaining superior light amplification in critical light-reflection zones
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 design achieves greater light amplification and brilliance in oblong gemstones, such as emerald cuts, with fewer facets, mimicking the brilliance of round brilliant cuts at a lower carat weight and cost.
Implementation Method 1
first two long crown facets extending at respective predetermined crown angles to the table plane; second long crown facets opposed to the first long crown facets and extending at said respective crown angles relative to the table plane; a first pair of long pavilion facets extending at predetermined respective pavilion angles relative to the table plane
Data Source
AI summary
A sparkling, oblong-shaped precious stone, such as an emerald or cushion cut diamond is formed by a planar table facet, a girdle, two pairs of long crown facets located between the table facet and the girdle, and the two pairs of long pavilion facets located between the base of the stone and the girdle.