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The Gem and Jewelry Institute of Thailand (Public Organization)
140, 140/1-3, 140/5 ITF - Tower Building. 1st - 4th and 6th Floor, Silom Road, Suriyawong,Bangrak, Bangkok 10500, Thailand
Working day and hours : Monday-Friday 8:30 A.M. - 4:30 P.M.
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