Knowledge center

Gem reports & jewelry

Read the report. Then read the object.

A laboratory report records measured and observed characteristics. It is not a retail appraisal, a beauty score or a substitute for evaluating the complete jewel.

Identity and grade establish a foundation; cut performance, craftsmanship, condition and provenance shape the final judgment.
01

Identity and origin

Determine whether a stone is natural or laboratory-grown and whether treatments are disclosed. For colored stones, geographic origin may also be addressed when determinable.

  • Match report number and inscriptions
  • Confirm measurements and carat weight
  • Read every comment and treatment disclosure
02

Cut performance

Proportions and finish influence how a stone handles light. Shape-specific issues—windowing, extinction, bow ties or uneven contrast—must be judged visually.

  • Observe in diffused and directional light
  • Look for balanced brightness and contrast
  • Check symmetry face-up and in profile
03

Setting and craftsmanship

Metal quality, prong security, fabrication, signed marks and design authorship can create value beyond the loose components.

  • Inspect prongs, gallery and shank
  • Confirm hallmarks and maker signatures
  • Identify repairs, replacements and resizing
04

Value context

Reports describe characteristics; appraisals answer a specific valuation purpose. Insurance replacement, fair market and liquidation values are not interchangeable.

  • Define the valuation purpose
  • Use comparable objects of similar quality
  • Separate asking prices from completed sales

Decision checklist

Before you assign confidence—or value.

  1. Verify the report directly with the laboratory.
  2. Match measurements, shape and inscription to the stone.
  3. Review treatment and growth-origin disclosures.
  4. Inspect performance and craftsmanship in person.
  5. Use a valuation method appropriate to the intended transaction.

Primary references

Continue with authoritative sources.

Use original records and recognized standards. Third-party summaries should never replace the issuing organization.

GIA Diamond Education

The 4Cs, diamond reports, treatments and laboratory-grown diamond guidance.

Open source

GIA Report Check

Direct verification of report data from the issuing laboratory.

Open source

IGI Report Verification

Official report lookup for diamonds and jewelry evaluated by IGI.

Open source

NCF perspective

Evidence first. Judgment second. Decision last.

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