Testing Methods

Gemstone testing methodologies and techniques

Gemstone Testing Methodologies

Professional gemologists use a variety of testing methods to identify gemstones, detect treatments, and distinguish natural gems from synthetics and simulants. Each method reveals different properties of the gemstone.

Refractive Index

Measures how light bends through a gemstone

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Specific Gravity

Determines density relative to water

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Spectroscopy

Analyzes light absorption patterns

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Microscopy

Examines internal features and inclusions

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UV Fluorescence

Tests reaction to ultraviolet light

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Inclusion Analysis

Studies internal characteristics

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Dichroscope Analysis

Detects pleochroism in colored gems

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Polariscope Analysis

Determines optical character and strain

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Chelsea Filter Test

Color filter test for emeralds and other gems

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Why Testing Matters

Proper gemstone testing is essential for:

  • Identification: Confirming gem species and variety
  • Treatment Detection: Revealing enhancements that affect value
  • Origin Determination: Establishing geographic source
  • Authenticity: Distinguishing natural from synthetic or simulant
  • Quality Assessment: Evaluating clarity and characteristics