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A diamond certificate describes what the stone is. An appraisal states what it would cost to replace. They are different documents, produced by different people, for different purposes — and confusing them is why some people insure a ring for the wrong amount, and why others are surprised when an "appraised value" bears no relation to what anyone will actually pay. Here is what each document is, who issues it, and which one you need.
Key takeaways
- A grading report (certificate) describes quality — the 4Cs and proportions. It assigns no monetary value.
- An appraisal assigns a dollar figure, usually for insurance.
- They are issued by different parties: a laboratory grades; a qualified appraiser values.
- Insurers typically want both — the report proves what it is, the appraisal sets the sum insured.
- An appraisal is usually Retail Replacement Value, which is deliberately higher than resale.
- An appraised value is not what you could sell the ring for. Nobody should treat it as one.
The grading report, or "certificate"
A diamond grading report is a description of a stone's measurable characteristics, produced by an independent gemological laboratory. It records carat weight, colour, clarity and cut, along with proportions — table, depth, crown and pavilion angles, girdle thickness and culet — plus polish, symmetry, fluorescence and a plotted diagram of any inclusions.
The essential point: it contains no price. A laboratory grades; it does not value. That separation is deliberate and it is what makes the report trustworthy — a body that both graded and priced stones would have an obvious conflict of interest.
The main laboratories are IGI, GIA and others. For lab-grown diamonds specifically, the difference between them now matters: IGI grades lab-grown stones on the full 4C scales, while since 1 October 2025 GIA has issued only a two-tier Premium or Standard classification for them. We cover that in IGI vs GIA and the 2025 GIA change. Every Montare stone is IGI certified precisely because a fixed house standard needs the individual grades to be legible.
The appraisal
An appraisal is a valuation. It describes the piece — often the whole ring, not just the stone — and states a dollar figure for a stated purpose. That purpose matters enormously, because the same ring has different defensible values depending on why you are asking.
Appraisals are performed by qualified appraisers, typically gemologists holding a credential such as Graduate Gemologist, and often working to the standards of an appraisal body. An appraisal on a finished ring will account for the centre stone, any accent stones, the metal, and the labour that went into it.
Critically, an appraisal is an opinion of value, informed by market data and the appraiser's judgement — not a measurement. Two competent appraisers can reach different figures for the same ring, which is normal and does not mean either is wrong.
Side by side
| Grading report | Appraisal | |
|---|---|---|
| Answers | What is this stone? | What is this piece worth? |
| Issued by | An independent laboratory (IGI, GIA) | A qualified appraiser or gemologist |
| Covers | Usually the loose stone | Usually the finished ring |
| Contains a price | No | Yes — that is the point |
| Based on | Measurement and trained observation | Market data and professional judgement |
| Changes over time | No — the stone does not change | Yes — markets move, so it needs updating |
| Needed for | Knowing what you bought | Insuring what you bought |
Every claim here is one you can check on the certificate — and we will walk you through a real one, no obligation.
Ask us anythingWhy the number looks high: Retail Replacement Value
The most common source of confusion is a figure that seems far above what the ring cost. There is usually nothing dishonest about it — it is answering a different question.
Most insurance appraisals state Retail Replacement Value: what it would cost to buy an equivalent piece at retail, today, if yours were lost. That figure includes retail margin and the labour of making a replacement, and it is calculated at full retail because that is what your insurer would actually have to spend to replace it.
It is therefore not:
- what you paid;
- what you could sell it for;
- a statement that you got a bargain.
That last one is worth naming plainly, because inflated appraisals are used as a sales tactic across the industry — a ring "appraised at" far more than its price implies a discount that does not exist. A high appraisal costs you money twice over: it does not increase what your ring is worth, and it raises the sum insured, which raises your premium. If an appraisal arrives at a number dramatically above the purchase price, that is a question worth asking rather than a compliment.
Which do you need?
For most people the answer is both, and they do different jobs.
You need the grading report to know what you actually own — and to prove it. It is what allows a replacement to be matched on specification rather than on a vague description, which is exactly when it matters most.
You need the appraisal to insure the piece. Most insurers require a valuation before they will schedule a ring on a policy, and many ask for the grading report alongside it. Our guide to engagement ring insurance in Canada covers how cover works here.
The combination is what protects you: the report fixes the specification, the appraisal fixes the amount. With both, a claim is a matter of matching a documented stone. With neither, you are relying on a photograph and a receipt.
Keeping an appraisal current
A grading report never expires — the stone's characteristics do not change, so a report from ten years ago describes the same diamond today. This is also why a report should be transferred with the ring if it ever changes hands.
An appraisal does age, because it is a statement about a market rather than about an object. Prices move, and in lab-grown diamonds specifically they have moved considerably over the past several years. An appraisal that is significantly out of date can leave you either under-insured or paying premiums on a figure the market no longer supports. Most insurers ask for periodic updating; it is worth asking yours how often rather than discovering the answer at claim time.
A note on lab-grown diamonds
Two things are worth being straightforward about.
First, lab-grown diamonds are graded exactly like mined ones — the same laboratories, the same 4Cs, the same equipment. A lab-grown grading report is not a lesser document, and any appraiser or insurer treating it as one is out of step with how the laboratories themselves work.
Second, on value: lab-grown diamond prices have fallen substantially as production has scaled, which is precisely what has made a large, high-grade stone attainable. It also means nobody should buy one as an investment, and we would rather say so than imply otherwise. The honest position is in lab-grown diamond resale value. An appraisal for insurance remains entirely worthwhile — the point of insuring a ring is replacing it if it is lost, not trading it.
The Montare approach
Every Montare centre diamond arrives with its IGI report, and the specification is fixed before we begin: lab-grown, D–E colour, VVS1–VVS2 clarity, Triple Excellent cut with table and depth in the ideal range for the shape, three carats minimum. The per-shape figures are published on our standards.
That documentation is the point. When a standard is fixed and independently certified, there is nothing to take on trust — you can read what you own, and so can an appraiser or an insurer. If you need a valuation for cover, ask us during your consultation and we will point you in the right direction. Our guide to reading a diamond certificate walks through the report line by line. Start in the ring builder or book a consultation.
Bring us any diamond you are considering — ours or someone else's — and we will read the certificate with you and show you exactly what the grades mean. No obligation.
Book a free consultation →Frequently asked questions
What is the difference between a diamond certificate and an appraisal?
A grading report describes the stone's measurable characteristics — the 4Cs and proportions — and contains no price. An appraisal assigns a dollar value, usually for insurance, and is an opinion of value informed by market data rather than a measurement.
Do I need both a certificate and an appraisal?
Usually yes. The report proves what the stone is, so a replacement can be matched on specification. The appraisal sets the sum insured. Most insurers want a valuation before scheduling a ring, and many ask for the grading report alongside it.
Why is my appraisal higher than what I paid?
Because most insurance appraisals state Retail Replacement Value — what it would cost to buy an equivalent piece at full retail today, including margin and labour. It is not what you paid, not what you could sell it for, and not evidence that you got a discount.
Can I sell my ring for its appraised value?
No. Retail Replacement Value is deliberately higher than resale value, because it answers what replacing the ring would cost rather than what a buyer would pay. Treating an appraisal as a resale figure is the most common misunderstanding about the document.
Who can appraise a diamond ring?
A qualified appraiser, typically a gemologist holding a credential such as Graduate Gemologist and often working to the standards of an appraisal body. Grading, by contrast, is done by an independent laboratory such as IGI or GIA, which does not assign value.
Does a diamond grading report expire?
No. The stone's characteristics do not change, so an old report still describes the diamond accurately, and it should travel with the ring if it changes hands. An appraisal does age, because it reflects a market rather than an object, and insurers generally expect it to be updated periodically.
Are lab-grown diamonds appraised differently?
They are graded identically — the same laboratories, the same 4Cs. On value, lab-grown prices have fallen substantially as production scaled, which is what makes a large high-grade stone attainable, and it also means nobody should buy one as an investment. An appraisal for insurance remains worthwhile, since the purpose is replacement rather than resale.
Should I be suspicious of a very high appraisal?
Yes. Inflated appraisals are used across the industry to imply a discount that does not exist. A high figure does not increase what your ring is worth, and it raises your sum insured and therefore your premium. If an appraisal lands far above the purchase price, ask why.
Every stone, documented. Read the report with us in a consultation, or start in the ring builder.
The Montare standard
Lab-grown · D–E colour · VVS clarity · Triple Excellent · 3ct minimum · IGI certified
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