How much 18kgp if i sell it?

The selling price of 18 karat gold plating (18KGP) depends on various factors, including market demand, the weight of the item, and the current price of gold. Typically, 18KGP items are less valuable than solid gold due to the thin layer of gold over a base metal. To determine a specific selling price, you would need to check the current market price of gold and consider the item's condition and craftsmanship. For an accurate estimate, it's best to consult a jeweler or gold buyer.