Nan Yang Gemological Institute
NGI, established in 2001, is a trusted provider of Gem Testing Lab services and Gemological Institute for Education in Far East Plaza. With more than 20 years of experience and state-of-the-art testing instruments, we specialise in precisely identifying various gemstones, jadeites and diamonds etc. Our independent expert advice and unwavering commitment to integrity have earned us recognition and instilled confidence and assurance in both buyers and sellers in the gem and jewelry industry.
Lab Services
Education
Gemstone Identification
This intensive gemstone course provides an excellent introduction to a wide range of gemstones, including popular varieties such as ruby, sapphire, emerald, opal, and quartz. Participants will acquire both theoretical knowledge and practical skills related to colored gemstones.
Course Content
- The fundamentals of gemstones, as well as over 20 different types of gemstones that are commonly found in today’s market, such as ruby, sapphire, and emerald
- The functions of various instruments, including but not limited to the microscope, spectroscope, and Gem tester, as well as how to interpret the results obtained from them
- The identification of various types of inclusions, treatments, and synthetics of the gemstones
Diamond Identification & Grading
This immersive course offers a captivating introduction to the fascinating world of diamonds, providing participants with the essential knowledge and skills required to identify and grade diamonds based on the 4Cs (color, clarity, cut, and carat), utilizing a variety of real diamond samples, videos, graphics, and textual materials.
Course Content
- The fundamentals of diamonds, including an overview of the grading system (4Cs)
- The various instruments used to perform diamond grading and the contents of a diamond grading report
- Identifying surface features, inclusions, color elements, cutting proportions, and treatments of natural diamonds, as well as the processes involved in producing synthetic diamonds and its special features
Jadeite Identification
This intensive jadeite course provides an excellent introduction to the world of jadeite, equipping participants with both theoretical and practical knowledge of this fascinating gemstone. By taking this course, participants will gain proficiency in identifying jadeites and their treatments, understanding the various classifications of jadeite, and distinguishing natural jadeites from their simulants.
Course Content
- The history and properties of jadeite and nephrite
- The classification of jadeite into commercial grades based on color and transparency, and an understanding of the different types of natural, treated, dyed, and synthetic jadeite, as well as the various treatment processes
- The ability to distinguish natural jadeite, Type A, from treated jadeite (Type B, Type B+C, composite, aged etc) and the common jadeite simulants
Jewellery Product Knowledge
This course provides fundamental knowledge that facilitate sales and communication in gems and jewellery retails.
Course Content
- An introduction to gemstones, jadeites, diamonds, and their common treatmentsÂ
- International policies for disclosing treatments, synthetic gemstones and diamonds
- Types of gemstone fashioning (cut), and jewellery settingsÂ
- Types of precious metals, hallmarking and calculation of gold prices
- Participants will develop essential skills in selecting and purchasing gemstones, diamonds, and jewelry. These skills will enable them to effectively recommend items to customers, leading to improved communication and increased sales
What Our Customers Say About Their Experience With Us
Maddy Barber
MADLY Founder /
Chief Brand Officer
Mr Zeng of Nan Yang Gemological Institute sets the gold standard in gemstone grading and testing. His integrity is unmatched, never compromising on classifications such as ‘pigeon blood’ or ‘royal blue’ unless truly warranted. His exacting standards and honesty make him one of the most respected gemologists in the industry and our go-to gem lab in Singapore.
Jay Ee
Little Jadeite House
Nanyang Gemological Institute is the best place to certify gemstones and jadeites in Singapore (and possibly Asia). Mr Zeng’s professionalism and accuracy are second to none and offer insights to the pieces that are being certified. Little Jadeite House uses NGI for all our certifications, and it has been a pleasant journey for the last 5 years and counting.
Zed
Founder of New Jade
I have been to this laboratory for many years. NGI is a responsible and independent laboratory that seeks to improve on its testing techniques constantly. Mr Zeng is particularly meticulous in his testing to ensure that information in laboratory reports is accurate and objective. Will definitely recommend this laboratory for any gemstone testing for a peace of mind.
Ken Pang
NGI's Customer
I was recommended by a jewelry shop to use this lab for the certification and appraisal of my jewelry and gemstones. The gemologists here are professional and quick in providing friendly and patient explanations. NGI is a reliable gem and jade testing lab for both certification and advice, and I absolutely love it! 🤗❤️🤗👍
Phoebe Loh
NGI's Customer
We had many doubts about our blue jadeite bangle, but Mr. Zeng and his two female assistants were incredibly kind, patient, and professional in explaining their authentication process. Their expertise and unexpected patience made a significant difference. I highly recommend NGI to anyone seeking gem and jade authentication. Our experience here was truly exceptional, and we couldn’t be happier.
Hamza
Nazim Brothers
NGI is the most preferred gemological lab in Singapore. We’ve relied on their gem testing services from the start. Mr. Zeng’s hard work and dedication are evident in his reports. NGI’s gem and diamond certificates are well received in Singapore and in this region. They are also well respected by the industry players in international trade fairs.
Julia Tsang
NGI's Customer
I have known this lab for years and have received numerous reports from them, which reinforces my trust in their work. Many reputable professionals also rely on this lab for their reports. I have great confidence in Mr. Zeng, whose exceptional standards set this lab apart. For anyone overseas questioning the legitimacy of their reports, I can assure you that they are reliable and not one of those labs that simply produce whatever is requested.
Mark Sutherland
NGI's Customer
I would 100% recommend this place for getting anything appraised in Singapore. We were sold fake jewelry, but Mr. Zeng helped us so much. He also explained various differences and what to look for when jewelry seems fake. He was efficient and quick, enabling us to get a full refund. We cannot be more thankful for his assistance.
Alan Yeo
HANXIANG,
Former Student of NGI
Embark on Zeng LaoShi’s extraordinary gemology courses funded by SkillsFuture. Gain practical skills to identify diamonds, jadeite, and gemstones, including distinguishing natural stones from lab-grown ones. With real-world applications and up-to-date insights, this highly recommended gemological journey is beneficial for novices and professionals alike.
Michael Koh
Caratell Co-Founder,
Â
I would also like to extend my gratitude to Mr Zeng for his exemplary work as a professional gemmologist. His dedication to maintaining the highest standards in gem identification and grading without compromising on quality is truly commendable. His expertise and integrity have been invaluable assets to our jewellery business, and we are grateful for his contributions to our industry. It is with great confidence that I recommend services of NGI to others in our industry and beyond.Â
Teri Chia (GIA G.G)
Founder of Blossom & Vicker, Former NGI student
I attended three of NGI’s courses between Nov 2022 and Mar 2023. I gained invaluable gemological knowledge through Mr. Zeng 20 over years real-world gem testing experience & huge gemstone sample collection for practical learning. I highly recommend NGI courses for industry professionals seeking the latest developments and the newcomers exploring the fascinating world of gemstones.
Nalaka Kularatne
Evni’s Gems
Mr Zeng is a very Professional and very detailed person when it comes to assessing any type of stone. Very Happy with their quality of the reports which even recognized by my overseas customers. Also, the staff will call and inform when to collect the reports. Recommend to anyone!
Saravanan Kasinathan (Alex)
Ministry of Gemstones
Mr Zeng is an awesome professional đź‘Ť
Able to identify the gemstones and their treatments accurately. Truly appreciate the good work! Thank you:)
A. Mohamed Bilal
President, Gem Traders Association of Singapore
Mr. Zeng is one of the best Gemologists in Singapore. I am truly impressed by his sense of responsibility and commitment to gem testing and identification.
Customers who ask for his opinion-certification for gems with international certifications trust his opinion. Congratulations!
News & Articles
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