A certificate is a document that declares what kind of gem the stone is. It states whether it has been treated and, in some cases, where it came from.
When a gem has an exceptional grade, it is the custom in the trade to refer to an international laboratory certification from an accepted laboratory. However, in the case of everyday stones, a local certificate will suffice. The difference between a local and international certificate is the authority behind the signature and the equipment that supports it.
Info Box: Local vs. International Certificate
A local certificate can identify a stone and note whether it has been treated. An international laboratory certificate carries greater authority for premium claims such as exceptional colour, rare origin, or untreated status.
Certificate?
Colour has the biggest impact on a gem’s value because some shades are so rare, they have acquired special designations in the trade. Some rare gems include Royal Blue sapphires, Pigeon Blood Red rubies, and Vivid Green emeralds.
Named Colour Grades That Require Laboratory Verification
These named colour grades are not everyday descriptions. They are trade designations that can significantly affect price.
Examples include:
Why Pigeon Blood Red Can Differ Between Laboratories
The case is different for the Pigeon Blood gemstone. It was popularised by GRS in the 1990s, but other laboratories have had their own take on the grade. As a result, two certificates on the same ruby might have two different interpretations of the grade.
How Certification Supports a Colour Premium
In order to confirm that a stone is of an exceptional grade, it will need to be appraised by an international laboratory. This will confirm the grade, and the stone will be able to command a premium for the exceptional grade.
Origin can add significantly to a gem’s value. Kashmir sapphires, known for their velvet blue colour; Burmese rubies, famed for their beautiful red colour; Colombian emeralds, which have a vivid green hue; and Paraíba tourmalines, which have a neon-like quality, are highly prized in the trade.
Premium Origins in the Trade
The following origins often carry a premium:
How Laboratories Determine Origin
As is the case with colour, origin needs to be certified by an international laboratory. Cutting-edge lab equipment can confirm whether a stone is from a premium location.
Kashmir sapphires, for example, have distinctive inclusions and trace elements that set them apart from Sri Lankan or Madagascan sapphires.
Why Origin Certification Gives a Claim Weight
It is this certification that allows a gem from a premium location to fetch a premium price. If a seller is claiming that a gem is from a premium location, the certificate is what gives the claim weight.
Highlight: A rare origin claim without an accepted laboratory report may not justify a premium price.
Many gems are routinely treated to enhance their beauty: sapphires are heat-treated to improve their colour, rubies are filled to improve their clarity, and emeralds are oiled to make them less prone to breakage.
Treatments That Create a Premium for Untreated Stones
When a gem is found to be untreated, it can command a premium price. This premium only has value if it can be documented that the gem is indeed untreated.
Examples of treatment-sensitive categories include:
What Only an International Laboratory Can Confirm
Only an international laboratory can confirm that a sapphire is unheated or that an emerald has not been oiled. A local certificate can identify a stone, but not with the degree of precision needed to document that it has not been treated.
Limits of Treatment Testing
Certification processes have one problem: laboratories can disagree about what they consider to be treatment and what they consider to be nature. Especially with sapphires and low-temperature heating, a laboratory might find a stone to be unheated while another will find that it has been heated.
Expert Insight: A certificate offers an expert opinion, but it is not an absolute statement of fact.
Not every stone needs a certificate from an international laboratory.
Best Uses for Local Certificates
Rule of Thumb: If the stone is commercial or astrological, and the price does not depend on a rare colour grade, rare origin, or untreated status, a local certificate is usually sufficient.
For Buyers: Match the Certificate to the Claim
To a buyer, the question is: What is the claim?
For Sellers: Avoid Over- and Under-Certification
To a seller, the question is: Does the certificate match the claim?
Certificate Match Matrix
| Claim or Use Case | Recommended Certificate | Why |
| Commercial or astrological stone identification | Local/independent laboratory certificate | Identifies the stone, notes qualities, and notes whether it has been treated |
| Exceptional colour grade: Royal Blue, Pigeon Blood Red, Vivid Green | International laboratory accepted for that grade | Confirms named grade and supports premium |
| Rare origin: Kashmir, Burma, Colombia, Paraíba | International laboratory accepted for origin | Confirms premium origin and gives the claim weight |
| Untreated status in commonly treated categories | International laboratory | Documents unheated sapphire or unoiled emerald with precision |
Highlight: The certificate should match the claim. Over-certification is a waste of money, and under-certification can leave the value of a stone in question.
A certificate reflects a price claim. When a stone is claimed to have an exceptional colour grade, a rare origin, or to be untreated, it means that the seller is claiming that the stone has attributes that cannot be evaluated by the buyer. In these cases, an international laboratory report will substantiate the claim and justify the price.
For commercial or astrological stones, a local certificate will suffice. The rule of thumb in the trade is that a certificate should match the claim.
By certifying a stone’s attributes, origin, and lack of treatment, the laboratory is offering an expert opinion. This might not always be an accurate opinion, as different laboratories can have different standards for defining colour grades and treatments, but it is an authoritative opinion.
Gems that command a premium should have the sort of certificate that will justify the premium. Over-certification is a waste of money, and under-certification can leave the value of a stone in question.
Quote: “A certificate reflects a price claim.” – Darshan Shah, Gemmologist
The price must be based on a claim that an appraiser cannot confirm by eye. If a seller is charging a premium for Kashmir but does not have a report from an accepted laboratory that determines origin, the premium is unwarranted.
Qualities that need international laboratory verification are those that have received special designations: Royal Blue, Pigeon Blood Red, and Vivid Green; rare origins such as Kashmir, Burma, Colombia, and Paraíba; and untreated stones in categories where it is the norm for a stone to be treated.
They will be enough for most commercial or astrological stones. Local certificates will identify a stone and note its qualities and whether it has been treated.
Many stones are treated. Untreated stones are rare. Certification is necessary to show that a stone has not been treated. Only an international laboratory can certify that a sapphire has not been heated or that an emerald has not been oiled.
We have covered the philosophy and the triggers. Now for the practical tools. Below is an honest overview of some of the main laboratories your certificate might come from — what each one is genuinely good at, and where it sits in the overall picture. Below this list is a reference guide to help determine certificates you can request/expect when buying a particular stone.
| Lab | Specialises In | What Makes It Relevant | Location | Authority Level |
| GIA | Diamonds | Gold standard for diamonds. Origin reports for coloured stones on select high-value pieces only. | International | High |
| IGI | Diamonds + coloured stones | Widely accepted in UAE and India. Practical for mid-range diamonds. | Dubai lab available | Moderate |
| HRD | Diamonds + coloured stones | Belgian institute. Credible and widely accepted in Europe, India and the UAE. Good for diamonds and standard coloured stones. | International | Moderate–High |
| GRS | Coloured stones only | Pioneered ‘Pigeon Blood’ and ‘Royal Blue’ colour grades. Preferred by auction houses. | International | High |
| Gübelin Gem Lab | Coloured stones + diamonds | Most respected for origin determination on high-value coloured stones. | International | Very High |
| SSEF | Coloured stones | Particularly strong for emerald origin. Preferred by European collectors. | International | High |
| DCL Dubai | Diamonds + coloured stones | Government-backed. ISO-accredited. Legally recognised in the UAE. | Dubai | Good for the UAE market |
| IGTL Jaipur | Coloured stones + diamonds | Reputable Indian lab. Reliable for identification and treatment disclosure. | India | Good for the India–UAE market |
| GII Mumbai | Coloured stones + diamonds | One of India’s oldest gemological institutions. Well regarded across India and the Gulf. | India | Good for the India–UAE market |
| Pangem, Pune | Coloured stones | Respected Indian lab. One of the few that photographs inclusions directly on the certificate — a unique identity record for the stone. | India | Good for the India–UAE market |
Use this as your reference guide before any significant gemstone purchase. However, we recommend connecting with us to ensure the credibility of a specific laboratory for a certain precious stone. Do reach out to us to verify and validate before your purchase.
| Stone Type and Situation | Recommended Certificate | Why |
| Astrological gemstone (Neelam, Pukhraj, Panna, Manik) — standard quality | DCL Dubai, IGTL Jaipur, GII Mumbai, or Pangem Pune | Confirms natural identity and treatment status. Proportionate to purpose and value. |
| Diamond — any value | GIA, IGI, or HRD | GIA for high-value. IGI and HRD widely accepted in UAE and India for mid-range. |
| Coloured stone — good quality, typical origin, standard colour | DCL Dubai, IGTL, GII, or IGI | Sufficient for identification, treatment disclosure, and buyer confidence. However, for higher value coloured gemstones, you may need specific certifications, like those mentioned below. |
| Natural Blue Sapphire — Royal Blue or Cornflower Blue colour grade | GRS or Gübelin | The colour grade on the certificate materially affects the value of the stone. |
| Natural Ruby — Pigeon Blood colour, possible Burmese origin | GRS or Gübelin | Origin and colour grade together determine the premium. Both must be documented. |
| Colombian Emerald — no treatment or minimal treatment | GRS, Gübelin or SSEF | Untreated Colombian emerald is rare. A credible certificate protects and proves that rarity. |
| Kashmir Sapphire — any quality | GRS, Gübelin or SSEF | Kashmir origin alone commands a significant premium. Must be verified by a top-tier laboratory. |
| Any exceptional stone — auction, inheritance or investment purchase | GRS, Gübelin or SSEF | The more irreplaceable the stone, the more important the documentation. |
If you are buying a gemstone for astrological purposes in the range most buyers operate in, a certificate from the Dubai Central Laboratory, IGTL Jaipur, GII Mumbai, or Pangem Pune is not a compromise. It is the right document for that purchase. It confirms what you need confirmed, it protects your ownership, and it does not cost more than the stone it accompanies.
This is the core answer to which gemstone certificate do I need in everyday buying situations.
If you are buying a stone that is exceptional in its category — exceptional colour, exceptional origin, exceptional treatment status — then the certificate matters more. Not because the stone is expensive, but because the certificate is the only thing that verifiably distinguishes it from a similar-looking stone that is not exceptional. In that case, the additional cost of a Swiss or GIA certificate is not overhead. It is part of what you are buying. Moreover, many sellers often provide more than one certificate for the same stone when it is an exceptionally rare gemstone that is under consideration.
The difference between these two situations is not always obvious to a buyer walking into a store. It is obvious to a gemologist who has been handling stones for 30 years. Which is exactly why the conversation matters.
For diamonds, GIA is the most widely respected globally. IGI and HRD are credible and widely accepted in the UAE and India — often more practical for mid-range diamonds due to faster turnaround and lower cost. For coloured gemstones, none of the three is the first choice — the Swiss labs (GRS, Gübelin, SSEF) carry more weight for high-value coloured stones. However, when dealing in exceptionally rare stones, one may be provided more than one certificate to confirm authenticity.
Yes — within its scope. A Gemstone certificate in Dubai issued by the Dubai Central Laboratory is ISO-accredited, government-backed, and legally recognised under UAE federal law. It is credible for routine gemstone identification and treatment disclosure, comparable to reputable Indian laboratories. It is not a global colour-grading authority for exceptional stones, but for the majority of purchases in the Dubai market it is entirely fit for purpose.
Because an untreated or minimally treated Colombian Emerald is exceptional within a category where treatment is the global norm. That rarity has real value — but only if it is verified by a laboratory whose treatment disclosure methodology the market trusts. A high-level certificate in this case is not about the price of the stone. It is about documenting something genuinely rare. In such cases, determining which gemstone certificate do you need becomes critical, and a basic report is not sufficient.
Yes. The Dubai Central Laboratory offers certification services for diamonds and coloured gemstones. IGI also has a laboratory in Dubai. For stones requiring Swiss-level certification, the stone would need to be sent abroad, which takes additional time and cost. At N Gopaldaas Jewellers we can advise you on the appropriate certificate for your specific stone and purchase.
Both are reputable Indian gemological institutions. GII (Gemological Institute of India) is one of India's oldest, based in Mumbai. IGTL is based in Jaipur — the heart of India's coloured gemstone trade. Both are credible for identification and treatment disclosure for astrological gemstone purchases.
Pangem is a respected Indian laboratory with strong credibility in the India–Gulf market. It is one of the few laboratories that photographs inclusions directly on the certificate, providing an additional layer of stone identity documentation — particularly valuable for astrological gemstones, where the stone's identity over time matters as much as its initial quality.
505.00
