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About GUILD

Founded in 1980 in Los Angeles, United States, GUILD Gem Laboratories is one of the world's top gemological laboratories in the identification, grading, origin determination, treatment detection and other aspects of colored gemstones. With a wealth of experience and a comprehensive database in firsthand field research, deep academic knowledge backs up every report from GUILD, whose  comprehensive database covers all the important gemstone varieties in the market. From its start-up gemstone identification institute to its authoritative brand based in the Asia-Pacific region and radiating around the world, GUILD Gem Laboratories radiates at a frequency of excellence within the international colored gemstone industry and is defined by professionalism, experience, science and innovation. Currently, GUILD has branches in Los Angeles, Shenzhen, Guangzhou, Zhuji (Pearl City) and Bangkok, to provide professional gemstone identification services for domestic and foreign practitioners.

  • 50
    +
    Gemstone Varieties
  • 1W
    +
    Gemstone Samples
  • 60
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    Minefields Investigation
History
  • 2024.10
    In October 2024, the GUILD Gem Laboratory officially released the Colored Gemstone Cut Report, further taking the cut as a separate item for rating, and quantitatively analyzing and evaluating the cut of gemstones from three aspects: the symmetry, proportion, and polishing of the gemstones.
    2024.10
  • 2024.01
    In January 2024, GUILD proudly launched its exclusive "Token of Love" report for rubies and sapphires. This report goes beyond mere presentation of authentic gemstone testing data; it precisely targets emotional consumption scenarios and integrates the need for emotional expression. It is not only an authoritative assessment of gemstone quality but also a profound commemoration of precious emotions, emphasizing the emotional value and cultural attributes of gemstones.
    2024.01
  • 2023.10
    In October 2023, Charles Carmona, the founder of GUILD Gem Lab, received the Lifetime Achievement Award from the American Society of Appraisers in recognition of his outstanding achievements over 40 years in various fields such as colored gemstone research, testing, and education worldwide, as well as GUILD's exceptional contributions to the Asian market.
    2023.10
  • 2022.12
    In December 2022, the GUILD (Zhuji) Gem Laboratory was established. Zhuji is the global production, processing and trading center of freshwater pearls, and it has gradually grown into the central market for pearl trading in China. Stationing in Zhuji not only demonstrates GUILD's attitude towards serving the industry, but also serves as a window for GUILD to improve the identification standard system for pearls of all categories and to carry out pearl research, education and testing.
    2022.12
  • 2022.09
    In September 2022, the first Guild Aurora International Gem and Jewelry Competition was held. The competition has been hailed by the industry as one of the top three jewelry events globally. The inaugural event in 2022 reached over 2 million people and surpassed 20 million in total exposure, attracting significant attention from the international jewelry industry.
    2022.09
  • 2021.12
    In December 2021, GUILD premiered the "2021 China Colored Gemstone Market Report" globally. This report is a masterpiece of multidimensional analysis and practical market validation, based on detection data randomly selected from 10,000 gemstones each from the five major categories of rubies, sapphires, emeralds, spinels, and aquamarines tested by the GUILD research team during that year. To this day, the annual colored gemstone market report and pearl market report have become essential guides for practitioners in the industry.
    2021.12
  • 2021.06
    In June 2021, GUILD released the "GUILD Pearl Identification and Grading Standards" and the "GUILD Pearl Testing Report," focusing on the research, identification, and education of all categories and color ranges of pearls. These efforts have contributed to the establishment of a standardized system in the pearl market. GUILD has successively introduced trade names to enhance market understanding of various pearl categories, continuously refining its standards in line with market developments. As such, GUILD is both a direct participant and a witness to the golden age of the pearl market.
    2021.06
  • 2020.06
    In June 2020, the GUILD (Guangzhou) Gem Laboratory was established. Guangzhou is a global center for jewelry processing and design, and it is also the city in China that was the first to come into contact with and accept colored gemstones. The coordinated operation between GUILD Shenzhen and GUILD Guangzhou not only continuously provides efficient testing services for the two locations, but also represents a crucial step for GUILD to further refine its colored gemstone standard system and delve deeper into the Chinese market.
    2020.06
  • 2020.05
    In May 2020, the GUILD Gem Laboratory released the English international academic journal Frontiers of Gemmology, whose content covers all aspects of gemstones from the mining areas, laboratories to the market, embodying the observations of the GUILD gemmologist team on the entire industrial chain of colored gemstones. Also in May, the GUILD Gem Laboratory introduced the "Santa Maria" color evaluation standard for aquamarines, which has become a byword for high-quality aquamarines.
    2020.05
  • 2019.12
    In December 2019, the GUILD Gem Laboratory (Shenzhen) obtained the certification of the China National Accreditation Service for Conformity Assessment (CNAS) and the certification of the International Laboratory Accreditation Cooperation (ILAC-MRA).
    2019.12
  • 2019.11
    In November 2019, the GUILD Gem Laboratory released the "Spinel Identification and Grading Standard" and was the first in the world to introduce the commercial term "Jedi Spinel".
    2019.11
  • 2019.05
    In May 2019, the GUILD (Bangkok) Gem Laboratory was officially established. Relying on the scientific research attitude, technical advantages and service system accumulated by GUILD over the years, the GUILD (Bangkok) Gem Laboratory has brought surprises to the Thai colored gemstone market within a short period of time.
    2019.05
  • 2018
    In August 2018, Andrew Lucas, a globally renowned field gemmologist, gemmology educator, and the founder of the "From Mine to Market" field gemmology concept, joined the GUILD Gem Laboratory, assuming the positions of Chief Gemmologist and Senior Vice President. With Andy's addition, a new chapter has been opened in GUILD's exploration of field gemmology and the construction of gemstone identification standards.
    2018
  • 2017.09
    In September 2017, GUILD introduced the groundbreaking trade name "Verdant Green" for emeralds, establishing an aesthetic trend that prioritizes quality over origin. This has led to widespread recognition and praise globally, as high-quality emeralds are no longer solely evaluated based on their place of origin. With the thriving global colored gemstone industry, GUILD has continuously developed comprehensive identification standards for various gemstone categories, including emeralds, rubies, sapphires, opals, spinels, aquamarines, morganites, and tsavorites, through extensive field research and standard sample analysis.
    2017.09
  • 2017.03
    In March 2017, the GUILD Gem Laboratory (Shenzhen) obtained the China Metrology Accreditation (CMA) qualification, becoming the first international laboratory to enter the Chinese mainland. CMA has strict requirements and regulations for gemstone testing laboratories. The laboratory must strictly abide by relevant laws, regulations and rules, and can only obtain the CMA qualification after meeting the requirements in many aspects such as personnel, environment, reference materials, experimental methods, etc. and passing the strict review by professional personnel.
    2017.03
  • 2016
    In April 2016, the GUILD (Shenzhen) Gem Laboratory was established, officially opening a new chapter in the Asia-Pacific market. As the first international brand laboratory to enter China, GUILD quickly assembled an appraisal and research team mainly composed of Chinese local powerhouse gemmologists, and launched research on the standardization of colored gemstones tailored to the characteristics of China's colored gemstone market.
    2016
  • 2013
    From 2013 to 2015, Charles Carmona, the founder and Chief Gemmologist of the GUILD Gem Laboratory, was once again invited by the World Bank to serve as a gemmology consultant for the Gemmology Centre of Tanzania. After that, the GUILD Gem Laboratory carried out seven field investigations in Tanzania, obtaining a large amount of precious research data on the origin of colored gemstones and A-type gemstone standard samples. In 2015, Charles Carmona, the founder and Chief Gemmologist of the GUILD Gem Laboratory, was elected as a member of the Board of Directors of the American Gem Trade Association (AGTA). Over the past 35 years, the GUILD Gem Laboratory has grown into a well-known and authoritative gemstone appraisal institution in the industry.
    2013
  • 2006
    From 2006 to 2007, Charles Carmona, the founder and Chief Gemmologist of the GUILD Gem Laboratory, was specially appointed as a gemmology consultant by the World Bank, and GUILD was invited to establish a gemstone testing laboratory at the Gemstone Institute of Madagascar. In the same year, the GUILD Gem Laboratory conducted several comprehensive and in-depth on-site gemmological investigations in Madagascar, known as the "Island of Gems".
    2006
  • 1999
    The GUILD Gem Laboratory has become the first laboratory to be stationed in Cairo, Egypt, to provide international colored gemstone consultation services. Since then, the international colored gemstone consultation services of the GUILD Gem Laboratory have been carried out in Ho Chi Minh City, Vietnam (in 2006) and Puerto Vallarta, Mexico (in 2006) respectively.
    1999
  • 1998
    Charles Carmona, the founder and Chief Gemologist of GUILD Gem Lab, published the book "The Complete Handbook for Gemstone Weight Estimation," which has become an essential guide for professional colored gemstone buyers. This publication demonstrates GUILD's unwavering commitment to continuous exploration in the field of colored gemstones.
    1998
  • 1985
    Since 1985, GUILD Gem Lab has been a founding member of the International Colored Gemstone Association (ICA) and attended the inaugural ICA annual conference. In February 2023, Ruby Liu, President of GUILD, and Andrew Lucas, Senior Vice President of GUILD, delivered a speech titled "The Development of the Chinese Colored Gemstone Market" at the ICA annual conference.
    1985
  • 1980
    In April 1980, GUILD Gem Lab was established in Los Angeles, USA. GUILD is an international gemstone laboratory that provides services such as gemstone identification, grading, origin determination, and enhanced treatment detection. To this day, GUILD has laboratories in the United States (Los Angeles), China (Shenzhen, Guangzhou, Zhuji), Thailand (Bangkok), Sri Lanka (Beruwala), and other locations. With a professional, scientific, and innovative spirit, GUILD offers clients professional and reliable testing services.
    1980
  • 2024.10
  • 2024.01
  • 2023.10
  • 2022.12
  • 2022.09
  • 2021.12
  • 2021.06
  • 2020.06
  • 2020.05
  • 2019.12
  • 2019.11
  • 2019.05
  • 2018
  • 2017.09
  • 2017.03
  • 2016
  • 2013
  • 2006
  • 1999
  • 1998
  • 1985
  • 1980
Qualification and Honor
 
Number：0755-82323565
Email：leo.hu@guildgemlab.com
Address：Room 3C08, Addcon Building, Shuibei 1st Road, Luohu District, Shenzhen, Guangdong Province, China

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