The majority of the jewelry I work with are .925 Sterling Silver and either Yellow or Rose Gold Filled (not to be mistaken with gold plated which I do not use under any circumstances as it does not hold up over time in my experience) I do offer a handful of pieces as a 14k solid gold option where gold filled cannot be used.  You can read more about what gold filled jewelry is on the Caring for Your Jewelry Page - www.themilkyfern.ca/care