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) 2019 June 19, 2019June 19, 2019 Entries Now Open ! Advertisement English Edition Preview Download Advertisement (English Edition) Instructions to Candidates Contact Numbers : 011-2579184, 011-4324674, 011-4324675, 011-4324676 Email – [email protected] Source – Sunday Observer (2019.06.16)