JAPAN GEM RESEARCH LABORATORY
Color, inclusions and spectral properties provide the clues.
Our laboratories in Tokyo and Bangkok bring observation and research together
to understand the characteristics of each gemstone.
SAPPHIRE · THE WORLD WITHINSapphire inclusions / Photograph by JGRL
ABOUT JGRL
About Japan Gem Research Laboratory
Practical experience.
A scientific approach.
Japan Gem Research Laboratory provides professional gem testing informed by experience in colored stone identification, classification and origin research, supported by reference data and published research.
With laboratories in Tokyo and Bangkok, Thailand, we offer testing of colored stones, pearls and diamonds for jewelry businesses in Japan and overseas.
We continue sampling and analysis in mining regions and pearl farms, developing our reference collection and contributing to gemological research.
GEMOLOGICAL SERVICES
Look beyond appearance.
Examine the evidence.
COLORED STONES
We examine colored stones for identity, detectable treatments and geographic origin, drawing on reference materials and research to assess their characteristics.
PEARLS
From distinguishing pearls and imitations to examining nacre thickness, freshwater and saltwater identity and quality characteristics, we study each pearl's properties.
DIAMONDS & SIMULANTS
We distinguish natural and laboratory-grown diamonds, including HPHT- and CVD-grown material, and examine look-alikes such as moissanite.
KESHI PEARL IDENTIFICATION
An X-ray view
inside non-bead-nucleated pearls.
X-ray imaging reveals bead nuclei, nacre and internal cavities that cannot be assessed from appearance alone. We examine these structures to distinguish Keshi pearls from bead-nucleated cultured pearls.
Some Keshi pearls contain irregular internal cavities. A cavity alone does not establish the presence of an inserted bead; we also examine the surrounding nacre and internal structure.
In this example, no bead nucleus is visible in the Keshi pearls at the top and bottom. The central cultured pearl shows a round bead nucleus surrounded by nacre.
Images and explanations: Japan Gem Research Laboratory (JGRL)
Explore the basic fees for our reports and examinations. Business and trade clients are welcome to discuss pricing individually.
View service feesOBSERVATION & ANALYSIS
From inclusions seen under the microscope
to properties revealed through spectroscopy.
We assess observations and analytical results together, selecting methods appropriate to each item and examination.
Our specialists bring more than 20 years of practical experience to ongoing research, including work in mining regions and pearl farms and the publication of academic papers.
PROFESSIONAL QUALIFICATIONS
GIA Graduate Gemologist
Fellow of the Gemmological Association of Great Britain
Asian Institute of Gemological Sciences Accredited Gemologist
Enlarge photograph THE WORLD WITHIN
The shape and distribution of inclusions can help reveal a gem's characteristics. We record this microscopic world as part of our daily identification and research work.
Rutile inclusions in sapphire from MyanmarTHE JGRL GEM LIBRARY
Crystals, origins, colors, hardness and cuts.
An approachable dictionary of gemstone fundamentals.
HOW TO VERIFY
Use your report to
check its registered details.
Have the letters and numbers printed on your report ready, including any hyphens and periods.
Enter the report number in the search field, or scan the report's QR code with your smartphone camera.
Check the number, gem name, weight and other details. Contact the issuing laboratory if any information does not match.
QUESTIONS & ANSWERS
Look for the report number or No. on your original report. Enter it exactly as printed, including letters, numbers, hyphens, periods and underscores.
Check the letters, numbers and punctuation. If the correct number still returns no result, contact the issuing laboratory.
Online verification checks registered report information. It does not establish that a particular item is the one described in the report. Check the item, original report and registered details together.
Yes. Scan the QR code on the report with your smartphone camera and open the link to view that report's verification page.
OUR LABORATORIES
Japan Gem Research Laboratory (JGRL)
Japan Gem Research Laboratory
TOKYO, JAPAN
110-0005BANGKOK, THAILAND
919/1 Silom Road, Jewelry Trade Center