Stunning amber necklace with silvertone heart chain

I received this as a gift many years ago from someone who buys a lot of vintage jewellery. I have no idea if this is amber or if it just looks like amber, so I am pricing it as if it's faux. The chain doesn't have any markings, so I will assume it is silvertone. It's a gorgeous piece but I need to make room for some new jewelry I just bought on Poshmark. :) Bundle for savings, or make me an offer.