China National Standards

China ruby GB Standards List

  •  China "ruby" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 32863-2016 ruby grading
    红宝石分级    		 China National Standards
    ruby
    English PDF
    GB/T 4051-2013 Synthetic ruby
    红色合成刚玉    		 China National Standards
    ruby
    English PDF

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