Ndị isi ọrụ nnwale ime obodo gụnyere NGTC (National Gemstone Testing Center) na GIC (China University of Geosciences). Ndị isi mba ụwa gụnyere GIA (Gemological Institute of America), GRS (GemResearch Swisslab), na SSEF (Swiss Gemmological Institute). Maka ọla bara uru, họrọ ụlọ ọrụ mba ụwa; maka ihe nkịtị, nke ime ụlọ zuru oke.
#Nnwale Ihe ịchọ mma #Ndị ọchịchị #NGTC #GIA #Asambodo #LongfengXu
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