Anyone can print a card that says "certified". The word has no protected meaning, and there is no licence a laboratory must hold before issuing reports. What separates a testing laboratory from a certificate printer is what happens before the card is printed — and the way to find out is to ask. A good laboratory will answer these questions readily; a poor one will not want to.
About the examination
What instruments do you use? For gemstones, at minimum a refractometer, a polariscope, a stereo microscope, UV lamps, a balance for specific gravity, and a spectroscope. For Rudraksha, a stereo microscope and an X-ray unit. A laboratory that identifies gemstones "by experience" without a refractometer is guessing well.
Which tests will be performed on my article, and will they be named on the report? The report should list the tests carried out. A finding without a method is an assertion.
Do you X-ray Rudraksha, and is the compartment count written on the report as a number? The only test that verifies the mukhi count. "X-ray tested" without a count is not an answer.
Can you detect glass filling, heating and diffusion? What are the limits? An honest answer names what the bench can and cannot resolve — "we detect glass filling and most heating microscopically; low-temperature heating and beryllium diffusion need spectroscopy, which we do not have, and we say so on the report."
Is your testing non-destructive? It should be. No scratching, no acid, no hot needle unless specifically agreed for a hidden spot.
About the report
Will the report carry weight, dimensions and a photograph of my article? Without these it cannot be matched. Anatomy of a test report.
How is the report verified, and by whom? On the laboratory's own website or by direct contact with the laboratory, using a report number — and, ideally, a PIN held only by the card holder. Verification through a seller's page is not verification. How online report verification works.
Does the report include a valuation? It should not. Why a report does not include a valuation.
Does the report make astrological or spiritual claims? It should not.
What does the report say when a determination cannot be made? The right answer is undetermined or not excluded, stated plainly.
About the laboratory
Where are you, and can I visit? A physical address, a telephone that is answered, an email that is replied to.
Who examines the articles, and what is their training? Trained gemmologists for gemstones; examiners experienced in Rudraksha for beads.
Are you independent of the sellers whose articles you test? The key question. A laboratory owned by, or in undisclosed partnership with, a seller has a conflict of interest that undermines its reports. Any relationship should be disclosed on request and, ideally, on the report or website.
How is your fee set? A flat fee per article, the same whatever the finding. A fee that depends on the result — or on the article's "value" — is an incentive to find value.
What happens if your finding is challenged? A reputable laboratory re-examines, considers a second opinion, and corrects errors openly.
What the answers tell you
A laboratory that answers all of these directly, names its instruments and its limits, verifies its reports on its own system, keeps valuation and astrology off the card, and states its independence is one whose reports mean something. A laboratory that is vague about equipment, verifies only through sellers, prints values, or cannot be found at its address is issuing documents, not findings.
Frequently asked questions
Is an ISO certification a guarantee of a good laboratory?
An ISO 9001 certification concerns management systems, not gemmological competence. It is a reasonable sign of organisation, not a substitute for the questions above.
Should a laboratory belong to an industry body?
Membership of gemmological associations indicates training and engagement. It is helpful, not decisive.
Are big-name international laboratories better?
For advanced questions — origin, low-temperature heating, lab-grown diamond confirmation — they have instruments a bench laboratory lacks. For routine identification, a competent local laboratory with the right equipment gives the same answer faster and cheaper.
Can I ask to watch the testing?
Many laboratories will show the process on request. It is a reasonable thing to ask.
What if the laboratory refuses to answer?
That is your answer.