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I know of no accurate way to test the chains with home made methods. An acid test is the best way to find out. A jeweler should do this for a very small charge.
If gold plated, not gold through and through, the plate will eventually wear away and the chains will tarnish in those areas. If a brass like metal is underneath, the color when shiny is close to gold and it might be hard to tell the difference until tarnishing happens. There are several ways I have seen suggested for home testing but I cannot recommend any as being reliable.
Acid tests are done by two methods. In one case, a bit of the item is rubbed onto a small slate "test stone", rubbing hard enough to remove some metal from the surface of the item. Gold of a know karat is also rubbed on the stone. Acid is placed on the marks and observed. If the sample dissolves right away, it is not gold. If the sample remains, the color is compared to that of the acid effects on the known samples and from that an approximate karat value is assigned. The test is better at telling what is not gold than closely telling the karat of the gold.
The other method is to make a mark on the jewelry in a place that shows very little. The mark must go through the surface and a bit into the metal. Acid is applied. If not gold, the metal is generally a base metal containing copper and the acid will bubble with a green color. This is a sure giveaway the item is not gold through and through. If the item is gold, the test may leave a darkened, tarnished looking spot or a dull spot on the metal. This can be polished and brought back to a shiny surface.
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