@ Kiddo... There is another problem here! Now, you don't have the gold necklace anymore which I am interested in. The substance which was gold now has turned into something else through your electroplating thing. The substance is still there in other form but where is your gold necklace?
Are you getting the relationship here between the gold and the gold necklace? The moment you removed gold from the gold necklace, there is no more gold necklace there. There is some other necklace which I have no knowledge of since I don't know what the new material is. Now, reverse the process of electroplating thing on new material and bring it back to gold. Aha, there is gold necklace again ! Necklace is merely a sound which do not have corresponding reality because the gold necklace cannot exist independent of gold but gold can become many gold necklaces. Even you did electroplating thing, the substance was there but the gold necklace was not there. In summary, the 3 laws of causation are:

1) An effect can never be without a cause. ( Gold necklace cannot be without the Gold).

2) Effects are cause itself in different forms ( Gold necklace, Gold bracelets, Gold Jhumkas etc. are different forms of Gold itself. In all these jewelries, there is nothing but Gold. Gold has assume many shapes and mind has given different names for practical purpose of differentiation)

3) From the effects if the cause is removed, nothing remains. ( For example, remove gold from the gold necklace, there will be nothing. Note: removing here means annihilating completely, not just mere transforming into another material)