Luther Diamonds  ·  Certification

Every stone comes with
proof you can hold.

Not just a promise — a certificate, a video, and a team you can reach. Because trust shouldn't be invisible.

Why it matters to us

You're not just buying a ring.
You're trusting us with a moment.

That's why every piece we send comes with third-party certification from the world's most respected labs — not because we have to, but because we want you to feel absolutely certain. You deserve to know exactly what you're getting, down to every facet.

Third-Party Certified Independent labs,
zero bias
Your Unique Certificate Specific to your
exact stone
Reviewed Before Setting You see it and approve
before we proceed
Lifetime Authenticity Your certificate
never expires
Diamonds

Natural & Lab-Grown Diamonds

Whether you choose a natural stone formed over billions of years or a lab-grown diamond with the same physical and optical properties, both come with recognized certification.

GIA

Gemological Institute
of America

The world's most widely recognized diamond authority. GIA certification verifies the 4Cs — cut, color, clarity, and carat — with scientific precision and global credibility.

Included as standard with all natural engagement ring builds
IGI

International Gemological
Institute

The leading authority for lab-grown diamonds. Every engagement ring in our collection ships with a physical IGI certificate — a document as permanent as the ring itself.

Included as standard — shipped physically with every ring
For Lab Engagement Rings

You'll see your diamond
before we set it.

We know it can feel strange to trust a stone you haven't chosen yourself. So we made sure you can. Here's exactly how it works.

01

Place your order

Choose your setting and complete your purchase. Our team gets to work right away selecting your stone.

02

We email you within 24hrs

You receive a video of your exact stone filmed in our vault, plus the IGI PDF certificate — your stone, not a generic example.

03

You approve, we set

Happy with what you see? Give us the go-ahead and we set your stone. Simple as that.

The Luther's Standard — guaranteed on every ring
Color
D · E · F
Colorless — the highest grade
Clarity
VS2 or above
Eye-clean — no visible inclusions
Cut · Polish · Symmetry
Triple Excellent
Highest grade across all three
Colored Gemstones

Lab-Grown Rubies, Sapphires,
Emeralds & Alexandrite

Every colored stone in our collection is lab-grown — exceptional quality, vivid color, and ethical provenance. Each one certified independently, so you know exactly what you're wearing.

Emerald
GRC Certified

Lab-Grown Emerald

We source only high-grade lab-grown emeralds selected for deep saturation, vivid color, and eye-clean clarity — the same optical beauty as their natural counterparts, at a fraction of the environmental cost.

Color: Deep, vivid green — Muzo-type saturation
Clarity: Eye-clean, no visible inclusions
Origin: Lab-grown — identical chemical composition to natural
GRC certificate included as standard for all stones 1ct and above

What the certificate covers

Stone identity — species, variety, and lab-created origin confirmed
Color grade — hue, tone, and saturation assessed independently
Clarity grade — type and visibility of any inclusions
Carat weight — precisely measured and recorded
Unique stone ID — registered for secure future reference
Example certificate
LabGem Research Center (GRC)
Stone typeLab-grown emerald
OriginLaboratory created
Stone IDGRC-2026-XXXXX
GRC

About Gem Research Center (GRC)

An independent laboratory specializing exclusively in colored gemstone certification. GRC reports are trusted across the industry for their precise, detailed analysis — covering species identification, color assessment, and quality grading. Your certificate is issued directly by GRC, with no involvement from us, ensuring complete objectivity.

Working with a natural colored stone? On rare occasions, for fully custom projects, we source natural rubies, sapphires, or emeralds. These come with GRC certification as standard, with the option to add GIA certification for investment-grade pieces. Talk to our team about a custom project →

For Lab Diamond Engagement Rings

Your stone, documented.
Before it ever leaves our vault.

When you order a lab diamond engagement ring, we send you two things within 24 hours: a PDF of your IGI certificate and a video of your exact stone filmed in our vault. You review both, approve the stone — then we set it and ship your ring.

Sample IGI Certificate The official IGI document for your exact stone — every grade, every measurement, your unique certificate number. Click to download.
Your exact stone — on video Filmed in our vault before setting. You see the brilliance, the cut, the fire. Approve it, and we set it.
Prefer something rarer?

Elevate your ring with a
natural diamond.

Every natural diamond has its own story — formed deep within the earth over billions of years. Our team will hand-source options matched to your exact preferences and walk you through each one personally.

Enquire Now →

Questions about certification? Speak with our team — we're here to help, not to sell.

Luther Diamonds  ·  Every piece verified. Every client certain.