Summary: A certificate only protects you if it is genuine and matches your stone. Before paying, check the issuing lab, report number, species and variety, natural or synthetic status, treatment (heated or untreated), weight in carats and ratti, dimensions, shape and cut, and the origin note along with the seller's policies.
You have found a gemstone you like. The colour looks right, the seller sounds confident, and a certificate is included. Most buyers stop checking at that point, and that is where costly mistakes begin.
A certificate is only useful if it is genuine, belongs to your stone, and says what the seller claims it says. A report can be real and still describe a different stone, or leave out the one detail that decides the price: whether the gem has been heated or treated. Here are 8 things to confirm before you pay, whether you are buying a Neelam, Panna, Pukhraj, Ruby or any other gem for astrological or personal use.
1. Check Who Issued the Certificate
Not every certificate carries the same weight. A report from an established, independent gemmological laboratory is a very different document from a card printed by the seller’s own shop.
Look for the lab’s full name, address and contact details on the report. Gem Selections, for example, works with government lab IGI-GTL certification. Whichever seller you buy from, make sure you can name the lab and find it online. If the lab cannot be traced, treat the certificate as marketing, not proof.
Not every lab deserves the same trust, so it helps to know which government certifications actually matter before you compare sellers.
2. Match the Report Number to Your Stone
Every genuine report has a unique number. Check that:
- The number on the report matches the number on the stone’s packaging or sleeve.
- The photo on the report matches the stone in your hand (shape, colour, visible features).
- The report date is reasonable, and the document is not blurred, altered or photocopied.
If the lab offers an online report check, use it. A report that cannot be verified with the lab that supposedly issued it is a red flag.
3. Confirm the Gemstone Species and Variety
The report should clearly state what the stone is, for example Natural Corundum, variety Blue Sapphire or Natural Beryl, variety Emerald.
Watch for vague wording such as “blue stone” or “green gem”, and for look-alikes sold under a premium name. A Citrine sold as Yellow Sapphire or a Green Tourmaline sold as Emerald will cost far less to produce, which is why correct identification is the first thing a certificate must give you.
4. Look for the Words Natural or Synthetic
This is the line that matters most. The report must say whether the stone is:
- Natural: formed in the earth, with no human involvement in its creation
- Synthetic (lab-created): chemically the same material but grown in a lab
- Imitation: a different material made to look like the gem
A natural stone and a lab-grown one can look identical to the eye. Only the report, backed by lab testing, can tell you which one you are paying for.
5. Check the Treatment Status (Heated or Untreated)
Treatment is the biggest reason two stones that look alike carry very different prices. Many gemstones, especially sapphires and rubies, are heated to improve colour and clarity. Others are filled, dyed or otherwise enhanced.
The report should state the treatment status in plain words, such as no indications of heating or heated. If the report is silent on treatment, ask the seller to explain why. For astrological use, many buyers specifically prefer non-heated, untreated stones, and a seller who offers govt lab certified gemstones should be able to show you exactly what the report says before you pay.
6. Verify Weight in Carats (and Ratti)
Gemstones are priced by weight, so a small error changes the price noticeably. Check that:
- The weight on the report matches the weight the seller quoted.
- You understand the conversion if you buy in ratti. As a rough guide, 1 carat is about 1.1 ratti, so ask the seller to state both clearly.
- The weight on the invoice matches the weight on the certificate.
If you plan to set the stone in a ring, ask whether the weight is of the loose stone. Weight on a mounted piece is harder to confirm.
7. Compare Dimensions, Shape and Cut
The report lists the stone’s measurements (length, width and depth in millimetres), shape (oval, cushion, round and so on) and cut style. Compare them against the stone using the seller’s measurements or a simple gauge.
A large gap can mean the report belongs to a different stone. A very deep or very shallow cut can also affect brilliance and price, so these numbers help you judge value, not just authenticity.
8. Read the Origin Note and the Seller’s Policies
Some reports mention a geographic origin, such as Ceylon (Sri Lanka), Madagascar or Burma. Origin can affect price, but it is an expert opinion, and not every report includes it. If a seller claims a premium origin, check that the report supports the claim in writing.
Before you pay, also confirm in writing:
- The return, refund and cancellation policy
- That the invoice lists the certificate number, weight and gemstone name
- How the stone will be packed and insured during shipping
A seller who is sure of the stone will put these terms on paper without hesitation.
Quick Recap: The 8-Point Gemstone Certificate Checklist
- Recognised, traceable issuing lab
- Report number and photo match your stone
- Correct species and variety named
- Clearly marked natural, synthetic or imitation
- Treatment status stated (heated or untreated)
- Weight in carats matches report, quote and invoice
- Dimensions, shape and cut match
- Origin note supported, and return policy in writing
Save or screenshot this list and run through it before every gemstone purchase, in a shop or online.
If this is your first purchase, it is also worth reading about the mistakes first-time gemstone buyers often make so you know what to avoid.
Ready to Buy a Certified Gemstone?
If you are choosing a Neelam stone, every piece comes with a lab certificate you can check against this list.
For any question about a report, call us on 1800 102 2394 or write to care@khannagems.com before you decide.
Frequently Asked Questions
1. Is a gemstone certificate enough to prove the stone is genuine?
No. A certificate helps only if it is issued by a recognised lab, carries a number that matches your stone, and can be verified with the lab. A certificate that fails any of these checks should not be trusted.
2. How can I check if a gemstone certificate is real?
Contact the issuing lab and confirm the report number, or use the lab's online verification if it offers one. Also compare the photo, weight and measurements on the report with the stone you received.
3. Does a certificate tell me if the gemstone is heated?
A proper report should state the treatment status, such as no indications of heating or heated. If it does not mention treatment at all, ask the seller why before you buy.
4. Why does a certified gemstone cost more than an uncertified one?
Certification involves lab testing fees, and sellers who certify their stones usually sell better quality and verified natural gems. The extra cost buys you proof of what you are paying for, which protects you from overpaying for a synthetic or treated stone.
5. Can two gemstones with certificates still have very different prices?
Yes. Price depends on quality, weight, colour, clarity, treatment status and origin. Two certified stones of the same variety can differ widely in price if one is untreated and the other is heated.
6. Should I ask for the original certificate or is a copy fine?
Ask for the original report, delivered with the stone. A photocopy or screenshot is easy to alter, so use it only to verify the number with the lab before you pay.