gold-plated
adjective uk/ˌɡəʊldˈpleɪ.tɪd/ us/ˌɡoʊldˈpleɪ.t̬ɪd/
(COVERED WITH GOLD)
镀金的
covered with a very thin layer of gold
gold-plated earrings 镀金耳环
Try to obtain a good quality plug, preferably gold-plated, to replace the existing one.