Approved Gemstone Testing Laboratories

Gem Rock Auctions has one of the largest range of Certified Gemstones online. Our goal is to have the most comprehensive and competitive priced range of certified Gemstones. Our Verified sellers can only have gemstones certified by the laboratories listed below. New laboratories can be submitted to our Gemstone Advisory Panel for inclusion to this list. 

Approved Gemstone Testing Laboratories Used On Gem Rock Auctions

Our Gemstone Sheriff program also reviews sellers descriptions to give buyers confidence in our Gemstones. The following table outlines the testing capability of the gemology laboratories used on GemRockAuctions


  • American Gem Society Laboratories (AGSL)

  • American Gemological Laboratories (AGL)

  • American International Gemological Laboratories (AIGL)

  • Gemological Institute of America (GIA)

  • International Gemological Institute (IGI)

  • International Gemological Laboratories (IGL)


  • Advance Gem Research Lab

  • Gemmological Institute of India (GII)

  • GTL (Gem Testing Laboratory)

  • Indian Institute of Gems & Jewelelry (IIGJ)

  • International Gem Testing Laboratory Jaipur

  • International Gemological Labs and Institutes

  • SDI Bangalore


  • Gem Certify

  • Gem studies laboratory

  • Gemmological Association Of Australia

  • Symmetry

  • Gem Val


  • AIG American International Gemlab

  • AIGS Laboratory

  • Al Ahsan Jewllers and Gemologists

  • Asean Jewelry Joint Stock Company - Hanoi (Vietnam)

  • BGL Burapha Gemolical laboratory

  • Bellerophon Gemlab Co Ltd

  • Beijing Guoshou Jewelry Testing Co.
    Ltd (Used For jade, Not In English)

  • Center For Gem and Jewelry (CGJ) - Sri Lanka

  • Ceylon Gem Lab (CGL) - Sri Lanka

  • Chanthaburi Gemological Laboratory Co.Ltd

  • China Hong Kong Commercial Union Jewellery Appraisal Centre

  • China Inspection Quality Letter (Beijing) Jewellery Jade Appraisal Centre

  • CIGTL - Pakistan

  • E G Lab - Emteem Gem Laboratory (Sri Lanka)

  • Emil Gem Laboratory (Japan)

  • Gem Institute of Thailand (GIT)

  • Gem Research of Asian (GRA)

  • Gem Solution, Gemological Consultancy (GSGC)

  • Gem-Gold identification center - Vietnam

  • Gemological Consultancy International (GCI)

  • Gemological Hallmark International Co ltd

  • GFCO

  • GGTL - Sri Lanka

  • GIC - Gemmological Institute of Colombo

  • Gold and Jewelry Institute (Vietnam)

  • GRS Thailand

  • Himalaya Gem Testing Lab

  • IGE Institutio Gemologico Espanol

  • Inter Gem Lab (IGL)

  • Gemological International Labratories (GIL)

  • Lotus Gemology

  • Nan Yang Gemological Institute (NGI)

  • Nuclear Gem Lab

  • PGTL - Precious Gem Testing Laboratories

  • Royal Gem Lab - Sri Lanka

  • SGS School Of Gemological Sciences

  • SLP Gem Laboratory


  • Tengchong Zhongjian Jewelry Testing Co.Ltd

  • The Gem Institute Kandy Sri Lanka

  • Tokyo Gem laboratory

  • VGC, Center for Gold And Gem Research and Identification

  • Zhong Gong Gem Testing Centre - Certificate Of Gems & Jades

  • Zhong Shou Jian (Shen Zhen)
    Jewelry Identification


  • GIL (Gemological International Laboratories Canada)

  • CGL (Canadian Gemlab Inc)

  • HKD Diamond Laboratories Canada


  • Antwerp International Gemological Laboratories (AIG)

  • AGTL

  • ALGT (Antwerp Laboratory for Gemstone Testing)

  • DGA-1

  • DSEF (deutsche Stiftung Edelstein Forschung)

  • European Gemological Laboratory USA (EGL)

  • French Gemological Laboratory

  • GLA - Gemmological Laboratory Austria

  • GLT - Bernhard Thal

  • Gübelin Gem Laboratory Ltd. (GGL)

  • GPC Netherlands

  • GRS Switzerland

  • HRD Antwerp


  • International Gemological Institute (IGI)

  • Laboratoire Français de Gemmologie (LFG)

  • LGEML Gemmological Laboratory

  • Swiss Gemmological Institute (SSEF)


  • Rodrigo Giraldo Gem lab

  • Ignius Laboratório Gemológico LTDA

  • Instituto Colombiano de gemologia

* Synthetic gemstone detection can be extremely difficult for Quartz (Citrine, Amethyst, Ametrine), Beryl (Aquamarine, Morganite). Advanced equipment must be used which some laboratories may not have.

** Jadeite treatments can be detected by basic equipment, however some treatments require advanced equipment which some laboratories may not have.

*** It is extremely difficult to test for treatment via irradiation. For this reason many reports do not mention irradiation as a treatment, even on commonly treated gemstones like Topaz.

Was this article helpful?

12 people found this article helpful



Himalayan Gem Lab in our city is working really great

9th Sep 2021

informative and visionary info

13th Jun 2019

I see some companies use a certificate called "GIL."
I don't see this on your chart. Would you please explain if this is legitimate?
Thank you

19th Jul 2018

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