Diamond Grading: £85

Diamond grading by post: a full grading report on a loose stone, in-house at GoldPaid

Read our reviews on TrustpilotIndependent written XRF reportA test result, not a UK hallmarkYour item returned tracked, postage includedNo obligation to sell

For a loose stone or an unset diamond, a full grading report covering the 4Cs, dimensions, an inclusion plot and a lab-grown screen, handled in-house at GoldPaid. Fixed at £85. Honest about what the report is and the escalation route to a UKAS-accredited lab if you need one.

Why use this instead of an Assay Office or AnchorCert?For consumer and probate work, the in-house report at £85 is faster (5-7 working days), priced openly, and posted UK-wide. AnchorCert is the right route specifically when a UKAS-accredited document is required by a named-scheme insurer or a high-value formal context, the report tells you straight which situations need that escalation.
A jeweller’s loupe beside a loose round brilliant diamond on a dark surface

Ask first, post later

Start with a question, not a parcel. Send a photo on WhatsApp or call, and you will get a straight answer on what testing tier suits your item and what the report will cover. None of it commits you to posting anything.

This is a UK-wide postal testing service. There is no shop to visit and no counter. Wherever you live, the process is the same: ask first, then decide.

Your 14-day cancellation right

Your 14-day cancellation right. This is a service bought at a distance, so you can cancel within 14 days for a full refund. We only start testing sooner if you ask us in writing, which is what lets us report inside 5 to 7 working days, and once the report is finished you can no longer cancel it. Full terms: XRF-pack terms.

How the grading service works

Gem work is handled in-house by GoldPaid’s gem specialist. We are not a UKAS-accredited gemmological laboratory; if you need a UKAS-accredited grading report (for example for a high-value insurance schedule), we will tell you straight and point you at AnchorCert Gem Lab as the escalation route. For most consumer, probate and trade gem questions, the in-house report is the right tool at the right price.

  1. WhatsApp a photo. A photo of the stone (loose or set) is enough for us to give an honest read on whether grading is the right tier and confirm the £85 fixed price. There is no charge for this step.
  2. Combined parcel. Send the stone in our prepaid Special Delivery pack. If you are also testing metal, both travel in one parcel.
  3. In-house grading. Our gem specialist runs the full grading workflow: 4Cs measurement, dimensions and proportions, inclusion plotting, lab-grown screen.
  4. Written report. A clear grading report with a plain-English summary, returned with the item.
  5. Item returned by Special Delivery. Same tracked, signed-for return route as the metal-testing service. Return postage included.

What a full grading report contains

A full grading report measures and records: carat weight, colour grade, clarity grade, cut grade, polish and symmetry grades, fluorescence, dimensions and proportions, an inclusion plot, and a screen for lab-grown identification. The report is written for a non-specialist with a plain-English summary on the front page.

For most consumer, probate and trade purposes (sale, family record, insurance schedule under specialist policies that accept independent valuation) the in-house report is the right document. Where a UKAS-accredited record is specifically required (typically for high-value scheduled insurance under a named-scheme policy), the report flags it and points you at AnchorCert Gem Lab in Birmingham or London as the escalation route.

When triage is the right step instead

If the question is "is it a real diamond at all", the £40 gem triage screen is the cheaper and faster route. Full grading is the right step when the diamond is genuine and you need a written record, for sale, insurance, or estate paperwork. Ask first and we will tell you straight which tier suits your stone.

How we run the test

  1. WhatsApp the photo. Tell us what you have, what you are trying to confirm, and what you would like the report to cover.
  2. Choose the pack. Single item, family pack, estate pack, probate pack, plating check, or an in-house gem report. Pricing is on the pricing page.
  3. Free tracked label. Special Delivery, tracked, signed for. Print at home or scan a QR at the counter.
  4. Tested at multiple points. A handheld Niton XL2 reads the elemental composition of every item. Plating, low-purity solder joints and unusual alloys are flagged.
  5. Report and return. PDF report inside 5 to 7 working days. Item returned by Special Delivery the same day. Nothing kept, nothing held back.

Postal cover and safety

Your parcel travels on Royal Mail Special Delivery, and Royal Mail cover may be available up to £2,500 depending on the postal method and cover level used, and if a parcel may be worth more than that we split it across more than one prepaid label at no charge, each with its own tracking number and cover.

Tracking begins the moment the parcel is scanned at the Post Office counter. You receive the tracking reference straight after we issue the label, and again the moment the parcel arrives with us.

What you get back, and when

Your item is returned by Royal Mail Special Delivery on the same working day the report is issued. Return postage and its cover are included in the testing fee. There is no separate return charge.

If, for any reason, an item cannot be tested (badly damaged surface, non-metallic core, equipment misalignment), we tell you straight, refund the testing fee, and return the item the same day.

Testing is testing

Plenty of gold buyers will offer a "free test" if you send your item in. That is a sales tool, not an independent service. This page is the other way round: you pay for the test and the report stands on its own. Whether you sell anything afterwards is a separate decision, and one we do not get involved in unless you ask.

The full reasoning is on the dedicated independence pledge page.

What this report is, and what it is not

This is an independent XRF (X-ray fluorescence) compositional analysis report. It identifies the elemental composition of the item submitted. It is not a UK hallmark and does not replace the legal requirements of the Hallmarking Act 1973. UK hallmarks may only be applied by an authorised UK Assay Office.

The report identifies the elemental composition of an item to the accuracy of the analyser. It does not replace a UK hallmark, an Assay Office fire assay, or a written valuation from a qualified valuer for insurance reinstatement purposes. We say so in plain English on the front page of every report.

If a report leaves any doubt, we will tell you what the next step would be, typically a UK Assay Office fire assay (destructive but definitive) for high-value disputes, or a written insurance valuation from a qualified independent valuer for reinstatement cover.

Why this is a calmer way to sell

Three things make GoldPaid a steadier route than a counter sale. You see a measured valuation in writing, not a verbal estimate. You decide at home, with nobody waiting. And if you decline, the return is free, tracked and signed for, so obtaining the valuation costs you nothing.

Common questions

Can the stone be graded while set in a piece of jewellery?

A full grading report needs the stone loose. The triage screen will say honestly whether your stone needs to come out of its setting first. If it does, we can recommend a trusted UK setter.

How long does it take?

5 to 7 working days from receipt. Faster if the triage has already happened by WhatsApp.

Is £85 the total price?

Yes, £85 covers the grading, the written report and Royal Mail Special Delivery return postage. Nothing is added at the end.

Will the report value the diamond in pounds?

A grading report grades the stone; it does not value it in pounds. Market value depends on grading plus supply and demand and is set by the trade. For a written reinstatement value, the report can be taken to a qualified independent valuer, or we can add the Insurance Valuation Add-on (+£25) for an insurer-friendly figure.

Not the question you had? The full GoldPaid FAQ covers the rest, from postal cover and ID checks to what happens if you decline the offer.

Request a prepaid Royal Mail label for your XRF test

Two quick steps. Tell us which pack you want in the box below and we will confirm the price and how to pay before anything is charged. The label itself is prepaid and costs you nothing, and your items are returned to you free once the report is issued. Testing is a separate, paid service: if you are here to sell rather than to have items tested, the assay is free as part of selling and how it works is the page you want.

Two things worth knowing before you start, rather than after. Everyone sends a photo of a UK passport or driving licence, whatever the parcel is worth — it applies to every seller, so it is never a comment on you. And the parcel is handed in at a Post Office counter rather than dropped in a postbox: the receipt they give you is the proof of postage any compensation claim depends on.

Step 1: What are you sending, and how should the label arrive?

A rough description is plenty. This helps us confirm the right postal cover level before we issue the label. Skip if you would rather not say — the field is optional.

How would you like the label to arrive? Both are prepaid and both use Royal Mail Special Delivery Guaranteed, so pick whichever is easier. The QR code is already selected because it needs no printer, and you can change your mind later — just message us before you post.

Choose how your prepaid label arrives

Step 2: Where do we send it?

Your label arrives by email whichever format you chose, so nothing is posted out to you. We need your address because it prints on the label itself, and because it is where anything you decline is returned. UK addresses only.

Needed so the label can be addressed to you.

Would you rather ask a question first, or send a photo? Message us on WhatsApp. It is the fastest way to get a sense of what something is worth before you post anything.

Related pages

Independent XRF analysis, by post

Message us before you order a test

WhatsApp a clear photo and any question you have. We confirm the pack, the price and what the report will show, and you decide whether to order.

Prepaid Royal Mail Special Delivery label and tracked return included in the pack price. We confirm the price before anything is charged. The result is an independent written report, not an offer to buy, and you are never obliged to sell.