SMOKY QUARTZ 17.83CTW, Necklace & Ring set in 18K YG over 925 SS. EUC, J#47

I bought the set but I cant find the chain with it, so I added a YG Colored 18", unknown metal, but looks great. The 17.83CTW Smoky Quartz is set in 18zk YG ver 925 Sterling Silver. Since the chain shows no tarnishing, I suspect it may be gold colored stainless steel. This set is in Excellent Pre-owned Condition. I have marked this set 50% off because of being used, but I dont think I will be willing to take any offers lower than that because I will be netting only $40 after fees and that is very low for what the buyer is getting