Courses by Gem and Jewellery Research and Training Institute (GJRTI) / Courses in Sri LankaDiploma in Professional Gemmologist, Sri Lanka (Dip. PGSL) – Gem and Jewellery Research and Training Institute (GJRTI) 2018 August 14, 2018 Registration Now Open Advertisement Sinhala Edition Preview Advertisement English Edition Preview Download Advertisement (Sinhala Edition) Download Advertisement (English Edition) Instructions to Candidates Contact Numbers : 011-2579184, 011-4324674, 011-4324675, 011-4324676 Email – [email protected] Source – Silumina / Sunday Observer (2018.08.12)