Usually only 925 sterling silver jewelry with "S925" or "925" mark.I think your jewelry main material is 925 sterling silver and outside with gold plated.you can check follow link for you reference: www.jewelryinchina.com/silver-rings/new-fashion-coruscate-si

About goldtone jewelry,it say some jewelry plated with gold tone.there have two kinds of circumstances: 1)jewelry plated with real gold: For example,brass material/silver material jewelry with 18k gold/24k gold plated.its mean "inside/main material is brass or silver,and outside coated 18k/24k gold,the thickness usually is 0.25micron. 2)jewelry plated with imitation gold: For example,alloy material jewelry with … Read more