Manyan hukumomin gwaji na cikin gida sun haɗa da NGTC (Cibiyar Gwajin Gemstone ta Ƙasa) da GIC (Jami'ar Geosciences ta China). Hukumomin ƙasashen duniya sun haɗa da GIA (Cibiyar Gemological Institute of America), GRS (GemResearch Swisslab), da SSEF (Cibiyar Gemmological Switzerland). Don kayan ado masu daraja, zaɓi hukuma ta duniya; don kayan yau da kullun, na cikin gida ya isa.
#Gwajin Kayan Ado #Hukuma #NGTC #GIA #Takaddun Shaida #LongfengXu
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