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Welcome to MDI®

Master of Diamonds Institute® Laboratories

A tradition of Science and Education

MDI® is the leading source of knowledge, standarts, and education in gems and jewelry...


MDI® laboratories are staffed by expert scientists and gemologists working with state-of-the-art technology.

Expertise Precision

Advanced instrumentation and experienced visual observations deliver consistently accurate results.

Expertise Objectivity

All gemstones are analyzed under complete client anonymity to ensure objective analysis.

Expertise Integrity

As a non-profit organization, MDI® operates independently of commercial and private interests, political lobbies and advocacy groups.

Expertise Global Standard

MDI® reports are the benchmark of analysis and grading, and those who buy, sell or curate the world’s most important gems rely on MDI®.

  • Institute

    Students around the globe turn to MDI® for the knowledge, skills, and credentials that launch successful gem and jewelry career.

  • Research

    The world leader in gemological research, MDI®'s breakthrough discoveries deepen our understanding of gemstones and the world.

  • Protect

    Through research, education, and unbiased gem grading and anlaysis, MDI® strives to protect the gem and jewelry buying public by setting global quality standarts.