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What is IGI? The International Gemological Institute (IGI) is a global gemological laboratory that certifies diamonds, colored stones, and finished jewellery. It was founded in 1975 in Belgium.

What does IGI do? IGI issues independent grading and identification reports, appraisals, diamond authentication and origin attestations, and offers laser inscription services. It serves the public through diamond dealers and jewellery manufacturers.

Education at IGI IGI’s Schools of Gemology provide diamond and colored stone courses; graduates are awarded an IGI Diploma.

Where is IGI based and who owns it? IGI is headquartered in Antwerp, Belgium. In May 2023, Blackstone Group announced the acquisition of IGI.

Key milestones In 2007, IGI collaborated with the Tanzanite Foundation on the Tanzanite Quality Scale (TQS). In 2010, IGI opened its laboratory in Surat, its fifth diamond grading lab in India.

Scale and operations IGI employs 650+ gemologists, appraisers, and support staff and operates multiple laboratories and training centers worldwide.

Market position & quality systems IGI is one of the largest laboratories for certification of diamonds and fine jewellery and has achieved ISO 9001:2000 certification in several countries (including the US, Canada, India, and the UAE).

Official website igi.org

What is GGL? The Global Gemological Laboratory (GGL) is an international gemological institute that specializes in the grading, certification, and identification of diamonds, gemstones, and fine jewellery. Founded in 1985, GGL is renowned for its accurate and trustworthy gemological services.

What does GGL do? GGL provides independent and certified grading reports, diamond and gemstone identification, origin certification, and detailed appraisals for the jewellery industry. GGL also offers laser inscription services for diamonds and gemstones to ensure traceability and authenticity.

Education at GGL GGL’s Schools of Gemology provide courses on diamond grading, colored stones, and jewellery appraisal. Graduates receive the prestigious GGL diploma, qualifying them as certified gemologists and graders.

Where is GGL based and who owns it? GGL is headquartered in Geneva, Switzerland. The laboratory is privately owned and operates with a high standard of integrity in the gemological sector.

Key milestones GGL developed its own proprietary grading system in 1993 and became one of the first to introduce digital grading reports accessible online. In 2010, it opened a state-of-the-art laboratory in Dubai to serve the Middle Eastern market.

Scale and operations GGL employs over 700 gemologists, appraisers, and support staff across multiple laboratories around the world, including in North America, Europe, and the Middle East.

Market position & quality systems GGL is widely recognized as one of the top gemological institutions worldwide. The laboratory adheres to the highest quality standards, having earned ISO 9001:2000 certification and is accredited by several global gemological organizations.

Official website ggl-lab.com

What does “SGL” refer to? “SGL” can mean Solitaire Gemmological Laboratories, SGL Carbon, or Subsidiary General Ledger—three completely different things depending on context.

Solitaire Gemmological Laboratories (SGL) An independent gem-testing laboratory that grades, identifies, and inspects diamonds, gemstones, and jewellery. SGL operates laboratories in India, London, and Dubai, and offers services such as blockchain-enabled reporting, gem courses, and diamond/gemstone authentication. Buyers and sellers trust SGL’s grading certificates for reliable quality verification.

SGL Carbon A company that develops and manufactures carbon-based materials and products. Its solutions are used in automotive, aerospace, energy storage, and wind-energy industries, valued for their high strength and low weight characteristics.

Subsidiary General Ledger (SGL) An account that banks open to hold or transact in government securities. Banks maintain SGL accounts for their operations and other purposes related to government securities management.

What is the GIA? The Gemological Institute of America (GIA) is a nonprofit institute dedicated to research and education in gemology and the jewelry arts. Founded in 1931, its mission is to protect buyers and sellers by setting and upholding the standards used to evaluate gemstone quality.

What does the GIA do? GIA conducts scientific research, provides gem identification and diamond grading services, and offers a range of educational programs. Through its experts and library, it serves as a trusted resource for the trade, the public, and media.

Why is the GIA important? GIA establishes and maintains industry-accepted grading standards that promote transparency and protect consumers. Independent GIA reports help ensure confidence in gemstone quality and value across the global market.

What are the “Four Cs”? In 1953, GIA created the International Diamond Grading System and introduced the “Four Cs” of diamond quality—Cut, Clarity, Color, and Carat weight—which remain the global benchmark for evaluating diamonds.

Where is GIA located and how big is it? As of 2024, GIA is headquartered in Carlsbad, California, USA, and operates in 13 countries with 11 campuses, 9 laboratories, and 4 research centers.

Key facts: Type: Private nonprofit; Established: 1931; Academic staff: 21 Gemology & 9 Jewelry Arts instructors; Location: Carlsbad, California, United States.

Official website: www.gia.edu