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WO2025053799A1 - Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test - Google Patents

Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test Download PDF

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Publication number
WO2025053799A1
WO2025053799A1 PCT/TR2023/050266 TR2023050266W WO2025053799A1 WO 2025053799 A1 WO2025053799 A1 WO 2025053799A1 TR 2023050266 W TR2023050266 W TR 2023050266W WO 2025053799 A1 WO2025053799 A1 WO 2025053799A1
Authority
WO
WIPO (PCT)
Prior art keywords
precious stones
identifying
stones
control unit
camera
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/TR2023/050266
Other languages
English (en)
Inventor
Mehmet Can OZDEMIR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jtr Mucevher Teknolojileri Arastirma Merkezi AS
Original Assignee
Jtr Mucevher Teknolojileri Arastirma Merkezi AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jtr Mucevher Teknolojileri Arastirma Merkezi AS filed Critical Jtr Mucevher Teknolojileri Arastirma Merkezi AS
Priority to PCT/TR2023/050266 priority Critical patent/WO2025053799A1/fr
Publication of WO2025053799A1 publication Critical patent/WO2025053799A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/87—Investigating jewels

Definitions

  • the invention relates to a method used for identifying precious stones and distinguishing between natural and synthetic diamonds.
  • the device is also suitable for the analysis of other precious stones that glow under UV light and valuable objects of different shapes such as rings and bracelets.
  • Natural stones are formed under natural conditions of very high pressure and temperature, making them rare and highly valuable jewels.
  • synthetic stones produced in laboratories are commonly used in the jewelry field due to their affordability. Synthetic stones are optically, physically, and chemically similar to natural stones to a degree that they are indistinguishable to the naked eye.
  • diamonds which are among the most commonly used precious stones in the jewelry sector, are classified based on qualities such as clarity and color. Although they may appear the same at first glance, there are differences in the shade of their colors, variations in their fluorescent colors, or the size of inclusions within them.
  • WO2021 140128A1 discloses a method for irradiating a precious stone largely with ultraviolet radiation pulses at wavelengths of 225 nm or lower, capturing the luminescence emitted by the top and bottom parts of the stone, comparing these characteristics, and characterizing the composition of the precious stone based on this comparison.
  • the object of this invention is to provide a method for identifying precious stones, rings, bracelets, or other valuable objects of different shapes by examining them to distinguish between natural stones and those manufactured in a laboratory, and/or to determine the quality and physical properties of the stone.
  • One objective of the invention is to provide a method for identifying precious stones that requires less technical expertise, is fast, and has a high degree of accuracy.
  • the invention is an identification method for a test device comprising a body into which the precious stones are placed, and a movable tray to carry the stones to be examined inside the body; at least one UVC light source used for illuminating the stones; and at least one UVA light source used to enhance the accuracy of identifying the precious stones; at least one camera installed in the body captures images of the stones, and at least one control unit processes data from these images and at least one screen connected via a network connection for data transmission from a control unit.
  • the method comprises the steps of capturing at least one image under a light source with a 222 nm UVC wavelength through a camera at different lens apertures and selecting the most accurate image to be sent to a control unit; the control unit runs an image processing algorithm to examine the fluorescence and phosphorescence emissions of the precious stones; capturing images under a light source with a 365 nm UVA wavelength by a camera at different lens apertures and sent to the control unit to increase the accuracy of the data; runs an image processing algorithm by the control unit to examine the fluorescence and phosphorescence emissions; the accuracy of identifying precious stones is enhanced by adjusting the sensitivity setting defined in the image processing algorithm.
  • the accuracy of the image processing algorithm is enhanced, allowing for the most accurate identification as requested.
  • using different lens apertures to increase the accuracy rate provides users with the freedom to select the most accurate visual.
  • the sensitivity setting defined in the image processing algorithm is a value between 0 - 255. This allows the user to fine tuning the diagnosis of the stones that do not shine fully due to their characteristics but create suspicion.
  • the wavelengths of the light sources used for identifying precious stones or objects of different shapes are constant and a camera captures an image and sends it to a control unit, which processes the image digitally using an image processing algorithm.
  • the method comprises the steps of examining all the stones for their fluorescence and phosphorescence emissions by sequentially turning on multiple light values, examining the entirety of the precious stones under the light source, and identifying the precious stones.
  • the analysis of each stone placed inside the body is facilitated by examining the reflections over the entirety of the stone.
  • the test device comprises four light sources each with a 222 nm UVC wavelength, at least one light source with a 365 nm UVA wavelength, and a daylight source installed on the upper wall of the body.
  • This arrangement of light sources achieves the most accurate rate in distinguishing the stones. Synthetic diamonds, often called lab-grown, usually contain complex emission patterns. The most accurate light source placement helps eliminate situations that might cause suspicion to the user or the end consumer. Re-checking precious stones through specific wavelength light sources of 222 nm and 365 nm enhances the accuracy rate, making reliable identification possible.
  • the test device includes at least one external display connected via an interface element.
  • the display used is a smartphone or tablet. Through the interface used with the external display, the user can easily identify and view the status of objects whose quality-affecting characteristics are specifically selected for analysis on the device.
  • the method includes a cylindrical holder apparatus for placing objects of different shapes like rings or bracelets inside a body.
  • a cylindrical holder apparatus for placing objects of different shapes like rings or bracelets inside a body.
  • these objects need to be dismantled.
  • the provided cylindrical holder apparatus allows for the examination and identification of the objects without dismantling and damaging them.
  • multiple objects of different shapes like rings or bracelets are placed on a cylindrical holder apparatus; the holder rotates at determined angles via a motor connected to the holder; a camera captures multiple images at these angles, and the images are merged to examine the entirety of the object.
  • the examining the fluorescence and phosphorescence emissions of precious stones or objects of different shapes are conducted under a daylight source and covering the inner surface of the body with an anti-reflectance coating. This ensures that the most accurate images of reflections occurring during illumination of the precious stones under the light source are obtained. This coating prevents any reflections from surfaces like the lid or body that could affect the analysis during testing.
  • a tray inside a body moving the stones to be examined inside the body by pressing a lid located on top of the body, which causes the tray to move automatically via a rail.
  • the tray allows multiple precious stones to be placed at once, providing a compact structure instead of complex multi-part configurations. It enables the user to place and examine multiple stones without the need for adjustments, providing precise and easy use without having to interact with the device.
  • the tray is automatically opened through the interface provided on the front cover of the body with the external display.
  • the precious stones in question are either natural diamonds or diamonds produced in a laboratory. Diamonds are particularly the most sought-after stones in the jewelry industry. Synthetic diamonds resemble natural diamonds so closely that they are indistinguishable to the eye. Therefore, test devices that include a method for identifying precious stones are mostly used during the analysis of diamonds.
  • the examination of precious stones results in the identification of natural diamonds, zirconium, CVD, moissanite, HPHT as the type of diamond; a certificate can be created based on the test results obtained through at least one external display connected for data transmission. Synthetic diamonds are commonly used in jewelry, and for this reason, customers request a certificate to confirm that the product they purchased is a natural diamond. Jewelers and retail locations provide an analysis and a reliable shopping opportunity with a certificate directly accessible to the final consumer.
  • test device involved in the identification method is powered by a Type-C adapter. This provides a modern power option, achieving cost efficiency and ease of use.
  • Figure 1 represents a test device incorporating a method for identifying precious stones.
  • Figure 2 shows a perspective view of a structural arrangement of a test device incorporating a method for identifying precious stones.
  • Figure 3 is a representative display of the light sources located on the upper wall of the test device body and the camera used for capturing images.
  • Figure 4 displays a flowchart related to the method of identifying precious stones.
  • Figure 5 shows a flowchart of the image processing algorithm.
  • Figure 6 is a schematic representation of the UVC process used in a method for identifying precious stones.
  • a test device is shown in cross-section, capable of distinguishing diamonds through an image processing-based identification method by placing one or more precious stones, particularly diamonds, for examination.
  • a test device (1 ) can analyze diamonds placed on a tray (14) within a body (10) using an image processing algorithm (1 10).
  • the movable tray (14) automatically extends outward.
  • the tray (14) consists of a flat surface and can simultaneously accommodate one or more precious stones for analysis.
  • the surface of the tray (14) is covered with an anti-reflective coating (70) to prevent reflections.
  • the tray (14) can be manufactured from plastic, rubber, metal, or any suitable material.
  • Figure 2 shows a perspective view of an arrangement of the precious stone identification test device.
  • the body (10) of the test device (1 ) is in the form of a closed box.
  • the body (10) may be made of plastic, metal, or similar materials.
  • the body (10) protects components such as the control unit (50), camera (40), light sources (30, 32, 34), and motor (60) from any external factors.
  • the inner surface and the upper wall of the body (10) are covered with an anti -reflective coating (70) to prevent reflections.
  • the lid (16) on the front surface of the body (10) is shown in its open state in the figure.
  • a motor (60) is positioned. This motor allows a holder apparatus (not shown) placed on it to move in determined directions, enabling the analysis of objects like rings and necklaces through a cylindrical holder apparatus.
  • a camera (40) positioned to see all the stones placed on the tray (14) under the upper wall of the body (12) that faces inside the body includes UVC (30), UVA (32), and daylight (34) light sources for illuminating the precious stones.
  • Figure 3 provides a schematic representation of the upper wall of the body (12) of the test device (1 ).
  • the upper wall (12) includes a 16 MP autofocus camera (40), UVC (30), UVA (32) light sources, and daylight illumination (34) devices to illuminate precious stones on the tray (14) or a cylindrical holder apparatus.
  • the camera (40) positioned in the center of the upper wall captures images of the stones' emissions. Multiple images can be captured by the camera (40) at different lens apertures. The captured images are transmitted to the control unit (50).
  • Figure 4 shows a flowchart related to the method of identifying precious stones, specifying the use of different wavelength lights for analyzing the stones' emissions.
  • Figure 5 displays a flowchart of the image processing algorithm developed for the precious stone identification method. For instance, based on the measured range of a specified parameter, it is defined as “natural diamond” or “synthetic diamond.” Based on the ranges of values obtained from the emissions, they are identified as “zirconium,” “CVD,” “moissanite,” or “HPHT.”
  • the image processing algorithm (110) is performed on a Raspberry Pi-based control board and outputs to an external display via HDMI (not shown in the picture).
  • the interface created on the display allows control of the functions of the test device (1 ).
  • the interface enables the viewing of the status information of the analyzed objects.
  • Figure 6 provides a schematic representation of the UVC process used in the method for identifying precious stones.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne un procédé d'identification de pierres précieuses à l'aide d'un dispositif de test, comprenant un corps et un plateau pour supporter les pierres à examiner dans le corps, une source de lumière UVC, une source de lumière UVA, un dispositif de prise de vues qui capture des images à partir des pierres placées dans le corps, une unité de commande qui traite des données provenant d'images capturées par le dispositif de prise de vues, et un écran connecté par l'intermédiaire d'une connexion réseau à partir de l'unité de commande pour une transmission de données. Le procédé d'identification consiste à capturer des images sous une source de lumière avec une longueur d'onde UVC de 222 nm à travers un dispositif de prise de vues à différentes ouvertures de lentille et à sélectionner l'image la plus précise à transmettre à l'unité de commande ; l'unité de commande exécute un algorithme de traitement d'image pour examiner les émissions de fluorescence et de phosphorescence des pierres précieuses, améliorant la précision des données obtenues en capturant des images sous une source de lumière avec une longueur d'onde UVA de 365 nm à travers le dispositif de prise de vues à différentes ouvertures de lentille et les transmettant à l'unité de commande ; l'unité de commande exécute l'algorithme de traitement d'image pour examiner les émissions de fluorescence et de phosphorescence ; la précision d'identification de pierres précieuses est améliorée par ajustement du réglage de sensibilité défini dans l'algorithme de traitement d'image.
PCT/TR2023/050266 2023-03-20 2023-03-20 Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test Pending WO2025053799A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/TR2023/050266 WO2025053799A1 (fr) 2023-03-20 2023-03-20 Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2023/050266 WO2025053799A1 (fr) 2023-03-20 2023-03-20 Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test

Publications (1)

Publication Number Publication Date
WO2025053799A1 true WO2025053799A1 (fr) 2025-03-13

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ID=94924146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2023/050266 Pending WO2025053799A1 (fr) 2023-03-20 2023-03-20 Procédé d'identification de pierres précieuses à l'aide d'un dispositif de test

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WO (1) WO2025053799A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3032242A1 (fr) * 2014-12-08 2016-06-15 Shenzhen Dikai Industrial Co., Ltd. Appareil de test de pierre précieuse multifonctionnel et procédé associé
CN206208773U (zh) * 2016-10-26 2017-05-31 成都市产品质量监督检验院 一种应用于珠宝检测的紫外荧光灯
CN211652570U (zh) * 2020-01-10 2020-10-09 深圳市飞博尔珠宝科技有限公司 一种便携式双波长紫外荧光灯

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3032242A1 (fr) * 2014-12-08 2016-06-15 Shenzhen Dikai Industrial Co., Ltd. Appareil de test de pierre précieuse multifonctionnel et procédé associé
CN206208773U (zh) * 2016-10-26 2017-05-31 成都市产品质量监督检验院 一种应用于珠宝检测的紫外荧光灯
CN211652570U (zh) * 2020-01-10 2020-10-09 深圳市飞博尔珠宝科技有限公司 一种便携式双波长紫外荧光灯

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