TLC Amber halo pendant

TLC Amber halo pendant Gold plate frame. Halo design with faux diamonds. Oval cabochon. C. 1980s. New Nwot. On original placard. This amber shows visible pretty inclusions. The same manufacturer supplied genuine B.C. Jade, Rhodonite, Hematite, Paua shell. I’m just not sure if the amber and amethyst are natural or synthetic “lab” gems. I paid the premium price so I tend to think they are good quality at least! Issue: about two inches of the chain tarnished to a dark colour. Price reduced because of chain’s condition. The halo pendant is gorgeous. Price is firm. Thank you.