A proper professional appraisal should have the following elements included:...
Read MoreEXPERT DIAMOND & GEMSTONE CERTIFICATION
At World Gemological Institute (WGI), we provide expert diamond and gemstone certification with precision and integrity. Whether you’re a buyer, seller, or collector, our industry-recognized evaluations ensure confidence in every transaction.
Expert Diamond & Gemstone Certification
At World Gemological Institute (WGI), we provide expert diamond and gemstone certification with precision and integrity. Whether you’re a buyer, seller, or collector, our industry-recognized evaluations ensure confidence in every transaction.
EXCELLENCE IN GEMSTONE CERTIFICATION & DIAMOND GRADING
World Gemological Institute (WGI) is a renowned international organization that provides high-quality gemological education, research and certification services. Located in the heart of London’s Diamond District, Hatton Garden, WGI has quickly become a trusted name in the gemstone and jewellery industry, providing reliable information and services to professionals and consumers alike.
World Gemological Institute (WGI) is committed to promoting and preserving the integrity of the gemstone industry, providing unbiased and accurate information to diamonds, gemstones and jewellery buyers, sellers and enthusiasts worldwide. WGI’s team of experts is composed of highly qualified gemologists, diamond graders, and researchers who are dedicated to providing the highest level of service to our clients.
World Gemological Institute offers a wide range of services, including gemstone identification and certification, diamond grading and appraisal services. The Institute uses the latest technology and equipment to ensure the accuracy and reliability of the WGI reports, recognised worldwide by insurance companies, retailers, auction houses, private jewellers and wholesalers.
EXPERT GEMSTONE & JEWELLERY CERTIFICATION SERVICES
We provide expert diamond grading, gemstone identification, jewellery appraisals, and pearl certification. Our precise evaluations ensure authenticity, quality, and value, trusted by jewellers, insurers, and collectors worldwide.
DIAMOND GRADING
Our Diamond Reports cover the four C’s which are cut, colour, clarity and carat weight, as well as an in-depth diagram, which will give you a clear measurement and understanding of the diamond’s proportions.
JEWELLERY GRADING
The Jewellery Report, with a full-colour image, provide a detailed description of the item; it is also possible to include a price evaluation. This is a valuable service for retailers and private individuals, as the jewellery piece has been certified by an independent organization.
GEMSTONE IDENTIFICATION
Gemstone Identification Reports are requested for standard identification and verification of coloured stones, that includes species and origin of the material, detailed measurements, quality, weight as well as a photograph of the gemstone.
ACCURACY, INTEGRITY AND GLOBAL TRUST
With over 30 years of expertise, WGI offers precise diamond and gemstone certification, trusted worldwide. Our GIA-certified gemologists ensure accuracy, transparency, and integrity in every evaluation, providing confidence for buyers, sellers, and collectors.
Industry Expertise
With 30+ years of experience, our GIA-certified gemologists provide accurate, reliable, and trusted diamond and gemstone evaluations worldwide.
Global Recognition
Our reports are accepted by jewelers, insurers, and retailers worldwide, making WGI a trusted name in the gemological industry.
Advanced Technology
Using state-of-the-art gemological equipment, we ensure precise analysis, from diamond grading to gemstone identification and laser inscriptions.
FREQUENTLY ASKED QUESTIONS
Find answers to common questions about diamond grading, gemstone identification, and jewelry certification. Our expert insights ensure you understand our processes and make informed decisions with confidence.
Thermal enhancement refers to heating and is the most common treatment for the majority of gemstones. Other colour gemstones treatments are: lattice diffusion, fracture filling with oil or resin, leadglass and dyeing.
Different findings in other reports may depend from different time and condition of the analysis; new or improved techniques or equipment may be used along with the methods used by the person who actually performed the test.
If diamonds or gemstones are set in a jewel, their analysis can be affected by the way they are mounted; some cases can reveal the Not Applicability of the techniques used to state is a stone is natural, permanently or not permanently treated or if it is synthetic.
The valuation refers to a Recommended Retail Price (RRP) and in any case does not function as a guarantee or warranty, it acts only as a recommendation.
Diamond Grading Report
Jewellery Grading Report
Gemstone Identification
Rough Gemstone Identification
Gemstone Grading Report
Pearl Grading Report
Diamond Grading Report
Jewellery Grading Report
Gemstone Identification
Rough Gemstone Identification
Gemstone Grading Report
Pearl Grading Report
INSIGHTS & UPDATES
Why you need Insurance Valuation for your
Jewellery is often one of the most valuable assets that...
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How to Read – WGI ™ Diamond
The WGI ™ Grading Report includes an assessment of the...
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