There are ways to recognize your diamond na ka. If you do have time, we will have free seminar at Grand Sheraton Sukhumvit on 5 Sept. They start from 10.0-16.0 ka.
Hiranya Tangsubkul
G.G. (GIA), F.G.A
ABCJewelry - The Professional Jeweler
www.abcjewelry.co.th
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