Knowledge Center
Practical guides on diamond identification, gold testing, jewelry repair, gemology and jewelry business — written by the WJT Group team.
Diamond identification
How to Identify Real vs Lab-Grown Diamonds
A practical guide to telling natural, lab-grown and simulant stones apart using diamond testers, moissanite testers and gemological instruments.
6 min readGold testingGold Testing Methods Explained: Acid, Electronic and XRF
Compare acid testing, electronic gold testers and XRF gold analyzers for accuracy, speed and non-destructive purity testing.
7 min readJewelry repairEssential Jewelry Repair Tools for a Professional Bench
Build a reliable repair bench with the right soldering, polishing, measuring and inspection tools.
5 min readXRF analyzersWhat Is an XRF Analyzer and How Does It Work?
Understand X-ray fluorescence technology and why XRF analyzers are the gold standard for non-destructive precious metal analysis.
6 min read