China National Standards

China Grading{译} Industry Standards English PDF List

  •  China "Grading{译}" Industry Standards English PDF List:
    • Standard  Code Standard Title Standard Class Order
    QB/T 4113-2021 Colored Diamond Color Grading{译} {译}
    彩色钻石颜色分级    		 China Light Industry Industry Standards
    Grading{译}
    English PDF

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