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Diamond & Gemstone Expertise. Clarity for Every Decision.

A diamond or gemstone is more than its appearance. Its identity, characteristics, and treatment history can change the way it is understood, described, and valued. Knowing what you are looking at is the first step toward making an informed decision.

IDGL - International Diamond & Gem Laboratory - provides diamond grading and gemstone identification to help bring clarity to that decision. Whether you are choosing a stone, documenting a treasured possession, or preparing jewelry for your customers, reliable gemological information gives you a stronger foundation for the conversation.

Understand your diamond

Carat weight tells you how much a diamond weighs. Color and clarity describe different aspects of its quality. Cut influences the way a faceted diamond interacts with light. Together, these characteristics help explain why diamonds that appear similar at first glance can be very different.

Discover what diamond grading can tell you, what appears on a report, and how to use the results when comparing individual stones.

Discover the identity of your gemstone

Color alone cannot identify a gemstone. A red stone may be ruby, spinel, garnet, or another material. A stone described as natural may still have undergone treatment. An attractive trade name may leave important questions unanswered.

Gemstone identification helps establish a clearer description of the material. When treatment or geographic origin is important to your enquiry, the appropriate examination scope should be confirmed before submission.

Make sense of your report

A laboratory report turns gemological findings into a written record. Understanding that record means looking beyond a headline grade. The material description, measurements, results, comments, and limitations all contribute to the full picture.

Explore our report guides to learn where to find the information you need and how to interpret it in context.

Verify an IDGL report

Already have an IDGL report? Use the report verification service to look for its corresponding record. Enter the complete report number, compare the available information, and contact us if anything requires clarification.

An online record is an important reference. Matching that record to a physical stone may also require examination of its identifying characteristics.

Knowledge that stays with you

Our education library explains the 4Cs, natural and laboratory-grown diamonds, colored gemstones, treatments, and report terminology in straightforward English. It is designed to help you ask useful questions before your next purchase or submission.

Start with the stone. Move forward with understanding.

Explore our diamond grading and gemstone identification information, check an existing report, or contact IDGL to discuss the information you need.