Reports, pricing and the final exam
Goal: Read lab reports, understand pricing drivers, then pass the final.
Labs and what their reports cover
Identification report
Species, variety, natural/synthetic, treatments. Every stone you sell as natural above a few hundred dollars.
Origin report
Country of origin opinion (Burma, Kashmir, Colombia...). Adds value for ruby, sapphire, emerald, Paraíba, spinel, alexandrite.
Grading report
Diamond 4Cs; some labs grade coloured stones (colour name like 'pigeon's blood' or 'royal blue' is a lab-specific trade term).
Bangkok has several respected labs locally (GIT, Lotus, GRS, AIGS). For major ruby/sapphire sales, top-tier reports (SSEF, Gübelin, GRS, AGL, GIA, Lotus) are what buyers ask for.
Price drivers (relative, not numbers)
Prices move with market and quality; build your own price notes from real offers in Bangkok/Chanthaburi and auction results, not from charts.
Final exam
Two parts. Pass mark 80%.
A · Written (40 questions)
Drawn from all units plus database-generated ID questions. Use the Final exam button below.
B · Practical (10 stones)
For 10 stones: RI, bire, OC, SG → ID → likely treatment → grade card. Use the ID Helper only to check after you commit an answer.
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