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1.Precious metal classification Precious metal elements: osmium, iridium, ruthenium, rhodium, platinum, palladium, gold, silver. According to the GB11887-2002 , the jew...[More]
1:Simulated Jewelries: K-gold, gold plated, silver plated and etc are known as simulated jewelries.The simulated jewelries market is uneven, some good and some bad; so...[More]