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Learn about lab-grown diamonds

You do not need to become a diamond expert to make a good choice. Start with the decision you are trying to make, then use these plain-language explanations when a grade, report, or seller claim needs context.

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Our most useful starting points

The fundamentals

What are lab-grown diamonds?

How they are made, why they are real diamonds, and where they differ from mined stones.

Quality

The lab-grown diamond 4Cs

Understand cut, color, clarity, and carat without paying for grades you cannot see.

Certification

Grading and certification

How to read a grading report and why the laboratory matters.

A common buying question

Do lab-grown diamonds come with certificates?

Many loose lab-grown diamonds come with an independent grading report, often called a certificate. The report identifies the stone as laboratory-grown and describes its weight, measurements and quality. Small accent diamonds in finished jewelry may not have separate reports.

Before buying a center stone, check the report number with the issuing laboratory and make sure its details match the diamond listing. Current IGI and GIA reports use different grading formats, so read the document rather than relying on the laboratory logo alone.

Learn how grading reports work Understand the four Cs

Lab-grown diamond fundamentals

Start with the questions buyers ask most about what lab-grown diamonds are, why people choose them, and how the market is changing.

Understand diamond quality

Learn what affects beauty, price, and the way a diamond looks in everyday wear.

Diamond shapes

Choose a shape by its look, proportions, price, and the quality details that matter for that cut.

Fancy-color diamonds

Learn how lab-grown diamond colors form, what affects their appearance, and what to compare when buying.

Diamond comparisons

Understand the difference between lab-grown diamonds and common diamond simulants.