IGI Certified Lab Grown Diamonds & Hand-Picked Gemstones
Harlow Mercantile

We pick every stone one at a time. There aren't hundreds of them, and that's the point. What's here is what we'd be happy to keep for ourselves. Honest photos, honest prices, and every diamond ships with its IGI grading report.

Small Vault. High standards.

IGI Certified Diamonds
Ethically Lab-Grown
Secure Shipping
Signature Packaging
The Vault

Currently in the Vault.

Every stone here is one of one. When it sells, it's gone. New ones only show up once they've passed our own eye test.

The Grand Emerald
IGI Certified
Emerald · 1.88 ct

Emerald cut · IGI certified

  • IGI Certified
  • Color D
  • Clarity VVS2
  • 1.88 ct
The Marquise
IGI Certified
Marquise · 1.05 ct

Marquise cut · IGI certified

  • IGI Certified
  • Color E
  • Clarity VS1
  • 1.05 ct
Every stone, one at a time.

A vault, not a catalog.

We don't buy in bulk. Each stone is picked by hand, shot on the same ivory linen, and priced plainly. Once it leaves the Vault, that's it.

Every diamond carries its IGI grading report. Every colour stone is cut by an independent lapidary we know by name. That's the whole standard, and it's the only one we keep.

Notes from the Vault.

Polaroids we saved along the way. Not the polished catalogue shot. Just the first honest look at a stone before it was ready for the light.

See every stone →
  • Rosalie, a pink sapphire on ivory linen
    Rosalie, first light.Studio, morning
  • Genevieve, a blue sapphire photographed under raking light
    Genevieve, held to the window.Loose stone
  • Scarlett, a ruby resting on the vault cloth
    Scarlett, off the cloth.Vault bench
  • Celeste, a pale sapphire framed against soft studio grey
    Celeste, before setting.Grading tray
The Harlow Standard

How we do things.

N.º 01

Hand Picked

We pick each stone one at a time. If it isn't one we'd wear ourselves, it doesn't make the Vault.

N.º 02

IGI Certified Diamonds

Every diamond ships with its IGI grading report. Same 4Cs, independently graded.

N.º 03

Ethically Lab-Grown

Same crystal, same sparkle, grown in a lab instead of pulled from the ground.

N.º 04

Secure Shipping

Insured, tracked, and packaged with care. Some orders need an adult signature at the door.

N.º 05

Signature Packaging

Your stone arrives ready to gift, hold, or hand straight to your jeweler.

N.º 06

Honest Pricing

Fair prices, plainly listed. No pressure, no games.

The Shapes

A short field guide to the cuts.

Each shape moves light in its own way. Round brilliants throw the most sparkle. Emerald and asscher trade fireworks for smooth, mirror-like flashes. Oval and pear stretch the finger. The right cut is the one you can't stop looking at.

Browse every stone
Every diamond carries its full IGI grading report
Gold solitaire ring with an emerald cut diamond resting on champagne linen
Coming to Harlow

Made to be set.

Every stone in the Vault is waiting for the setting it'll spend its life in. We're working on ours. Simple settings built to let the stone do the talking.

Secure Shipping
Secure Checkout
Tracking Included
Ethically Lab-Grown
The Vault List

First look at new stones.

A short note when a new stone lands in the Vault. That's it. No spam, ever.