It means 18k rolled gold plated or plated with 18k gold. Hot promotions in 18krgp on aliexpress: Great news!！！You're in the right place for 18krgp. RGP – rolled gold plate; HGE – heavy gold electroplate; HGP – heavy gold plate; GEP – gold electroplated. It means 18 karat rolled gold plate. Gold · P after the stamp like "14KP" means 14 Karat plumb. Jan 13, 2017 - Top selection of 2020 Real Gold Jewelry, Jewelry & Accessories, Beauty & Health, Home & Garden, Lights & Lighting and more for 2020!.