How Lab-Grown and Mined Diamonds Are Graded

A diamond is loved for the light it casts. Whether it’s formed deep within the earth or created in a modern laboratory, its beauty is graded in exactly the same way. Lab-grown and mined diamonds are evaluated by independent gemological laboratories according to identical criteria.

At Nangi, we choose lab-grown diamonds because they offer exceptional quality, full traceability, and a sustainable origin. Each gemstone is set in pure gold, handcrafted in Sri Lanka with lasting beauty in mind.

Above: Diamond Band featuring 15 pear-shaped diamonds totaling an impressive 3,20 carats (depending on ring size)

The Universal Standard: The 4Cs + Three More

Diamonds are classified globally using the same system — the 4Cs — and this applies to both lab-grown and mined diamonds:

• Carat (weight)
• Color (graded D–Z for white diamonds)
• Clarity (purity/inclusions)
• Cut (the diamond’s slip, or how light reflects and sparkles)

In addition, experts often assess:

• Symmetry
• Polish
• Fluorescence (reaction under UV light)

The key point: Same language, same scale, same laboratories (such as IGI). The certificates look and read the same—no matter the origin.

Above: Radiant Diamond Ring 1,00 ct & 1,50 ct

Why Do Lab-Grown Diamonds Seem “Extra Beautiful”?

In a lab, the growth process can be controlled to favor more desirable combinations of color and clarity. The result? Reputable jewelers often offer a broader selection of bright, clear stones with fewer or subtler inclusions.

That doesn’t make them “mass-produced.” Each diamond grows individually, developing its own pattern and personality—and is certified one by one.

The romantic truth: Beauty lies in light. The right cut (slip) and proportions are still the most important factors for maximum brilliance—whether the diamond is from a lab or the earth.

Above: Brilliant Diamond Ring 1,50 ct

Certification & Laser Engraving — Your Guarantee

Every Nangi diamond (above a certain size) comes with an independent certificate and a laser-engraved ID.

• The number on the diamond = the number on the certificate
• You can always verify that your diamond is your diamond

This ensures confidence, traceability, and transparency at every step.

Above: Asscher Diamond Ring 1,00 ct stacked with Diamond Snake Tail & Align Love Band

How to Read Beauty: A Simple Guide

1) Cut first An ideal or excellent cut gives life to the stone—its brilliance (white light), fire (rainbow flashes), and scintillation (sparkle as it moves). A great cut > everything else.

2) Color

• D–F: icy white brilliance
• G–H: near-colorless — a beautiful and smart choice
• I–J: slightly warmer tones, stunning in yellow or rose gold

3) Clarity Choose VS–SI for an “eye-clean” diamond — meaning no inclusions are visible to the naked eye. Placement and type of inclusion often matter more than the number itself.

4) Fluorescence Rarely affects appearance. It’s a matter of taste — we visually inspect every stone for you.

Above: Round Diamond Ring 0,50 ct stacked with Diamond Swan Tail

Myths & Realities — Without the Filter

“Lab-grown diamonds aren’t rare?” / “Mined ones are?” In truth, diamond value is largely shaped by supply, demand, and a few dominant market players. Neither lab-grown nor mined diamonds are truly “rare.” What matters is beauty, cut, documented quality, ethics, and sustainability—the values that should define luxury today.

“Lab-grown means mass-produced and impersonal.” Not at all. Every lab-grown diamond forms on its own, graded individually, and issued its own certificate. At Nangi, we handpick each stone—with both our eyes and our hearts.

Above: Emerald Diamond Ring 0,50 ct & 1,00 ct

Why Choose Nangi

• Lab-grown diamonds selected for quality, ethics, and sustainability
• Handcrafted in pure gold by our RJC-certified goldsmith in Sri Lanka
• Transparent information on 4Cs, certificates, and laser engraving
• Personal guidance — we assess each diamond individually, not just by numbers

Explore our beautiful engagement rings here

What Should You Choose?

• Want maximum sparkle? → Prioritize the cut.
• Want icy-white color? → Choose D–E color.
• Want smart balance? → Look for E–F / VS–SI with an excellent cut.
• Unsure? We’ll send you direct links to each certified diamond so you can compare them side by side.

Above: Diamond Earrings

In Short

• Lab-grown and mined diamonds are graded the same (4Cs + symmetry, polish, fluorescence).
• Certificates and laser-engraved IDs ensure you get exactly the stone you selected.
• Lab-grown diamonds often offer stunning color and clarity—without being “mass-produced.”
• At Nangi, you get conscious luxury: breathtaking diamonds, honest guidance, and jewelry made to last.

Book a private viewing in our showroom — we’ll help you find the diamond and design that are perfect for you.