gemmology.dev
Gallery Playground Learn Quiz Tools Documentation
Gallery Playground Learn Quiz Tools Documentation

Tools

Calculators for the bench: SG by hydrostatic weighing, RI lookup, birefringence, critical angle, carat estimation, and unit conversion — alongside dichroscope, polariscope, and Chelsea-filter references.

Measurement & Calculation

SG, RI, birefringence, critical angle, dispersion, carat estimation, and density calculations.

Unit Conversions

Convert between carats, grams, millimeters, inches, Celsius, Fahrenheit, and calculate price per carat.

Optical Properties

Dichroscope results, polariscope interpretation, refractometer simulator, and pleochroism reference.

Lab Equipment

Chelsea filter simulator, spectroscope line calculator, and heavy liquid SG reference.

Gem Identification

Compare gems side-by-side, hardness reference, and fracture/cleavage identification guide.

Advanced Analysis

Treatment detection checklist, origin characteristics guide, and proportion analyzer.

gemmology.dev

Crystal structure visualisation and gemmological reference for FGA students and professionals.

Product

  • Crystal Gallery
  • CDL Playground
  • Learn
  • Quiz & Exams
  • Tools & Calculators
  • Documentation

Resources

  • CDL Specification
  • API Reference
  • CLI Reference
  • GitHub

© 2026 gemmology.dev. Code under MIT, content under CC BY-SA 4.0.

Built for the FGA community