How to Read an IGI Certificate (So You Know Exactly What You're Buying)

When you buy a diamond, the certificate is the one document that tells you exactly what you're getting. At AuraLume, most of our pieces can ship with an IGI certificate on request — here's how to read one without a gemology degree.

The 4 Cs, in plain English

• Carat — the weight of the stone. Bigger isn't automatically better; cut and clarity matter just as much for how a stone actually looks.
• Color — graded from D (colorless) to Z (visible tint). For white diamonds, the closer to D, the rarer and more colorless.
• Clarity — how free the stone is from internal marks (inclusions) and surface marks (blemishes). "VVS" means very, very slightly included; "VS" is very slightly included.
• Cut — arguably the most important for sparkle. Cut grade measures how well the facets interact with light, not the shape (round, oval, etc.).

Why certification matters for lab-grown

Lab-grown and mined diamonds are identical on a chemical level. What differs is the origin story — and a certificate is your proof of what you actually bought. An IGI report confirms the stone was grown in a lab, lists its exact grades, and gives you a reference number you can verify. That traceability is part of why so many people choose lab-grown as a conscious, "clean-origin" option.

A quick checklist when you shop

1. Match the certificate's report number to the stone you receive.
2. Look at cut first, then color and clarity within your budget.
3. Don't over-pay for a grade you can't see with the naked eye.

Want to see how we source and certify our stones? Read our About page, or explore pieces by intention in our collections.