18kgp is 18 carat gold plated so it is not gold inside just plated in gold which will wear off with time and sterling silver is silver all through it not plated.
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18KGP stands for 18 karat gold plated, which means the item is made of a base metal and coated with a thin layer of 18 karat gold. Sterling silver, on the other hand, is a precious metal alloy made of 92.5% silver and 7.5% other metals. Sterling silver is typically more durable and valuable than gold-plated items.