I've attached the silver info from Montana Silversmiths website: What materials are used to make Montana Silversmiths buckles and jewelry?
Though some designs may vary, in most cases Montana Silversmiths jewelry is created through a multi-step process that begins with a designer's hand sketch and engraving.
Each piece, except for German silver products, is minted in solid brass or zinc alloy and plated in pure sterling silver, 22 carat gold, and/or black nickel, as indicated in each product description. German silver pieces are minted in solid German silver and accented with brightly polished bronze. Since silver has a natural tendency to tarnish (oxidize) and scratch, we add Montana Armor to assist in retarding this natural process.
Earring posts, French wires, and lever backs are composed of hypoallergenic stainless steel.
Unless otherwise noted in the product description, most rings are manufactured with a solid sterling silver base then plated in shiny rhodium for a bright silver look with easy care. What is German Silver?
German Silver is a trade name for full 18 percent silver nickel plate polished to a jewelry finish for a beautiful, lightly aged silver look. Bronze accents are also brightly polished for a light gold appearance. German silver contains no sterling silver.
German Silver products are not plated, but minted in solid German Silver and, where applicable, applied with solid bronze accents.