a. 18K White Gold Plated Alloy / CopperPlating is a process of bonding a few layers of white gold to a base metal; most commonly used are copper, brass, white metal or nickel.It has no intrinsic value.Due to the layer of plating, over time with frequent use, the plating can wear off.More suitable for occasionally wearb. 925 Sterling SilverContains 92.5% of pure silver.Considered as precious metal, hence it has intrinsic value.Suitable for daily wear.Can be cleaned easily by using our complimentary silver polishing cloth if oxidation occurs.Can lasts forever if take care properly.Important tip: BEWARE: There are fake 925 sterling silver jewelries in the market. If the prices of sterling silver jewelry is too good to be true, never buy it. As it is usually fake although they are marked as .925.