The abbreviations used in this paper have the following meaning;
1. BOI = Board of Investment
2. DEP = Department of Export Promotion
3. ICA = International Colored Gemstone Association
4. JETRO = Japan External Trade Organization
5. TFRC = Thai Farmers Research Center
6. TGJTA = Thai Gems and Jewelry Traders Association
7. VAT = Value-Added Tax
8. WTO = World Trade Organization