How much is a gold plated necklace?

Gold Plating means a layer (outer) of Gold has been deposited on the object.The object can be steel,Copper,Iron,Aluminium etc; and also silver. There are many jewelry Designers.including a few big names,that design many varieties of GP. jewelry. The Gold weight is extremely less.All though they may look expensive. Discretion is a very essential quality while buying Gold Plated Jewelry,including the Big Names.