How Lab Grown Diamonds Are Graded & Certified
Lab grown diamonds are graded just like mined ones. Here's how it works.
Because lab grown diamonds are real diamonds, they're graded by the same standards as mined ones — giving you confidence in exactly what you're buying. Here's how grading and certification work.
Graded by the 4 Cs
Lab grown diamonds are assessed on the same four qualities as mined diamonds: cut, color, clarity, and carat. See Understanding the 4 Cs.
Certified by gem labs
Reputable lab grown diamonds come with a grading report from a gemological lab, confirming their qualities and identifying them as lab grown. It's your independent assurance.
How to read the report
A report lists the 4 Cs, measurements, and shape. Learn to decode one in How to Read a Gemstone Certificate.
What about moissanite?
Moissanite is graded for color, clarity, cut, and carat too, with quality stones being eye-clean and bright as standard. See How to Spot Quality Moissanite, and browse engagement rings.
FAQs
Are lab grown diamonds graded like natural ones?
Yes — by the same 4 Cs (cut, color, clarity, carat) and certified by gemological labs.
Does a lab grown diamond come with a certificate?
Reputable ones do — a grading report confirms the 4 Cs and identifies the stone as lab grown.
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