Home / Standards / GB/T 30712-2014 GB/T 30712-2014 Active Provision of permissible errors for measurement of polished diamond mass 抛光钻石质量测量允差的规定 Standard Type GBT ICS 39.060 CCS D59 Status 现行 Issue Date 2014-03-27 Implementation 2014-10-01 Responsible Dept 自然资源部(国土) Drafting Unit N/A