Free gemstone courses
Learn to identify, grade and cut gemstones
From the refractometer to the faceting machine. Every course is free to study. Members also get the lab tools we use every day.
Refractive index of key gemsUnit 6
Courses
Course · Workshop · Guide
Free · open nowCourse24 h24 units
Gemology Fast Track
Identify 310 gem types, use every standard instrument, spot synthetics and treatments, and grade cut and rough stones.
Foundation to practitioner
Open course
In developmentWorkshop
Gem Cutting & Faceting
Orienting rough, preforming, faceting machines, angles by refractive index, polishing and yield.
Beginner to intermediate
Coming soon
How the courses work
Short, visual units
Each unit is about an hour: diagrams, spectra, inclusion guides and real separation tests instead of long reading.
Practice at the bench
Every unit ends with a practical you do with your own stones and instruments, plus a quiz.
Final exam
40 questions mixing theory and identification from measured properties. Pass mark 80%.
Members' tools
Gem database
All 310 gem types with RI, SG, optics, treatments, look-alikes and sources.
MembersID Helper
Enter refractometer, polariscope and SG readings; get ranked candidates.
MembersFlashcards
Spaced-repetition decks for majors, collector gems, organics and man-made.
MembersGrading card & rough evaluator
Grade cut stones, estimate weight and yield, price rough backwards.
Members