Gemstone Characterization via Optical Coherence Tomography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for gemstone characterization, such as weight assessment and flaw mapping, are inaccurate, time-consuming, and costly, especially when stones are in settings, and lack accessible three-dimensional mapping capabilities, leading to significant variations in value determination.
Innovation Solution
The use of optical coherence tomography (OCT) with nanoparticles or microparticles to create a three-dimensional image map of gemstones, allowing for precise determination of carat weight, clarity, and flaw mapping without removing the gemstones from their settings, and distinguishing between synthetic and natural stones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gemstones are removed from settings for accurate weight assessment, then measurement precision is improved, but loss of time and increase in cost occur
Solution Approach 1:
The patent introduces optical coherence tomography (OCT) as an intermediary technology that enables non-contact measurement of gemstone properties through the setting. The OCT system uses optical waves to penetrate the gemstone and generate three-dimensional images, allowing weight and flaw assessment without physical removal from the setting, thus resolving the contradiction between measurement precision and time loss
2Measurement precision
If gemstones are removed from settings for accurate weight assessment, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces traditional mechanical measurement methods (requiring physical removal and contact-based weighing) with optical field-based OCT imaging. This substitution eliminates the need for complex mechanical handling equipment and allows measurement through the setting, reducing overall device complexity while maintaining precision
3Ease of operation
If traditional light microscope examination is used for flaw mapping, then ease of operation is maintained, but measurement precision and three-dimensional mapping capability are insufficient
Solution Approach 1:
The patent transitions from two-dimensional surface imaging (traditional microscope) to three-dimensional volumetric imaging using OCT. The OCT system generates cross-sectional images at multiple depths, creating a comprehensive three-dimensional map of internal flaws and inclusions, thereby enhancing measurement precision while maintaining operational simplicity through automated scanning
4Loss of time
If gemstones are examined in settings, then loss of time is reduced, but measurement precision deteriorates
Solution Approach 1:
The OCT system provides multi-functional capability, simultaneously enabling weight assessment, flaw detection, and three-dimensional mapping all while the gemstone remains in its setting. This universal approach eliminates the need to choose between time efficiency and measurement precision, as both goals are achieved concurrently through comprehensive optical imaging
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
Provides objective, precise, and repeatable assessments of gemstone dimensions, inclusions, and flaws, enabling accurate grading and value estimation, while allowing for the identification of gemstones based on refractive index and creation of a three-dimensional fingerprint map.
Implementation Method 1
optical coherence tomography (OCT) system; selectively directing the sample beam from an optical coherence tomography (OCT) system onto the gemstone; receiving a returned sample beam from the at least one interface; and generating a three dimensional OCT image map of the gemstone
Implementation Method 2
immersing the gemstone in a medium including nanoparticles, microparticles or reflecting particles, the medium having a refractive index greater than air at the wavelength of the sample beam
Implementation Method 3
immersing the gemstone in a medium with a refractive index selected to reduce any mismatch in the refractive index between the gemstone and the medium
Data Source
AI summary
The invention includes an improvement in a method of assessing a gemstone having at least one planar face with an internally reflecting surface including the steps of optically modifying the at least one planar face of the gemstone to return a sample beam from an internally reflecting plane corresponding to the at least one planar face to an optical coherence tomography (OCT) system; selectively directing the sample beam from an optical coherence tomography (OCT) system onto the gemstone; and generating an OCT image map of the gemstone to determine volume, gem carat weight and/or quality.