Link size~5x12mmNote: All our heavy gold-plated products have 18K 2.5-3 microns gold plating. The product is immersed in a gold bath and it stays there for some time, till the thickness of the gold layer is attained as per the needed micron plating. We refer to this as “Gold filled. It's anti-tarnish.How to take care of your gold-filled jewelry? There are a few basic rules that you must follow to keep your jewelry shiny, like removing your rings necklaces, and bracelets when you are cooking, cleaning, swimming, or showering. Clean your jewelry and then store it properly.