The metal quality used depends on the design. Usually its pure brass or an alloy of brass. Plating used is Electrophoretic and in some designs electroplating is used. The gold used for plating is of 18kt and 14kt purity depending upon the design and requirement. No hallmarking is required in this jewelry as there is a minimal use of gold in plating. The gemstones used are mostly natural and in some cases treated , details of which will be provided in the product description section. The gesmtones used are of semi precious quality and so a certification is not required to assess the quality of the gems. But a certication can be provided on a client's request. Certification will bear extra charges which can be discussed with the client. Do check our vast collection of gemstone jewelry in the "shop all" section.