Secure shipping · Tracking included · IGI certified diamonds
Harlow Mercantile
EducationGuide · 6 min read

How to buy confidently from the Vault.

A practical guide to buying a lab-grown diamond with confidence: what the Vault philosophy means, why every diamond has its own IGI report, and how to verify the stone before you buy.

Start with what you can verify

Buying a loose stone online is not risky when the facts are in front of you. The two things you can verify before you ever spend money are the independent grading report and the photograph of the exact stone.

Every diamond in the Harlow Vault ships with its own IGI grading report. The report number is laser-inscribed on the stone's girdle, so a jeweller can match the stone in hand to the paper. You can also look up the report number on IGI's public checker to confirm the grades match.

If a seller will not show you the full report for the exact stone you are buying, that is a signal to pause.

The Vault is small on purpose

We are an online-only boutique. We do not list hundreds of stones and we do not operate a showroom. The Vault is intentionally small because each stone is chosen one at a time, held, turned, and photographed before it is listed.

A small inventory means you are not hunting through a catalogue of average stones to find a good one. It means the stones that made it in are the ones we would be proud to own ourselves.

Every diamond has its own report

Some sellers advertise "IGI certified" but show a generic certificate or a sample report. At Harlow, the report you see on the listing belongs to the exact stone you are buying. It covers that stone's specific cut, colour, clarity, carat, measurements, fluorescence, and origin.

Gemstones do not carry IGI reports in the same way diamonds do. When coloured gemstones are added to the Vault, they will be described by their cut, colour, and origin rather than a diamond-style certificate.

What you see is what arrives

We photograph each stone as it is. No stock renders, no borrowed images, no stand-ins. The photo on the listing is of the exact stone that will be packaged and shipped to you.

Because every stone is one of one, once a Vault Piece is sold it leaves the Vault. The listing is not restocked with a similar stone later. That is why the Archive exists: to keep a permanent record of the stones that have found their homes.

Ask before you buy

There is no showroom to visit, so questions are part of the process. Send us a note about a report, a photo, a comparison, or a setting idea. A real person will reply, usually within one business day.

If you would like to see a video of a stone in daylight, or a close-up of a specific inclusion on the clarity plot, ask. We would rather answer every question before purchase than have a customer feel uncertain after.

Red flags to avoid

A few patterns are worth walking away from, no matter how good the price looks:

  • A listing that says "IGI certified" but will not show the report number or the full PDF for the exact stone.
  • Stock photography or renders instead of a photo of the specific stone.
  • Pressure to buy immediately, or a price that is only valid for a few hours.
  • No return policy, or a return policy that requires the stone to be unopened or unhandled.
  • A seller who cannot explain where the stone was grown, cut, and graded.

A trustworthy seller welcomes scrutiny. The stones we stand behind are the ones we are happy to explain in detail.

When you are ready to browse

Start with the shape that feels right, then filter by the grades that matter to you. If you are unsure, use the Compare page to weigh two or three Vault Pieces side by side. Save the ones you love to a wishlist and share the list with someone you trust.

Buying a stone is a meaningful purchase, but it does not need to be mysterious. The Vault is built to make the important facts visible: the report, the photo, the price, and the person on the other end of the email.

Still deciding

Talk it through with a real person.

Send us a note and we'll reply within one business day.

Contact us
Ready to browse

See what's in the Vault.

Every diamond includes its own IGI grading report, and every stone is photographed as it is, so what you see is what arrives.

Explore The Vault