Gemvara uses industry standard alloys in all of our precious metals. Our Sterling Silver is a minimum of 92.5% pure silver. The remaining percentage is made up of mostly copper and occasionally small amounts of germanium. 14k Gold is a minimum of 58.3% gold and 18k Gold is 75% gold. The composition of the remaining alloy varies, but yellow gold is most commonly blended with silver, copper, and zinc. Rose gold has a greater proportion of copper to give it a rosy hue. Gemvara's white gold is alloyed with palladium or nickel (along with silver, copper, and zinc) and plated with rhodium to brighten the white color. Platinum and palladium are both 95% pure and hypoallergenic. For both platinum and palladium, the 5% alloy is composed of other platinum group metals, ruthenium or iridium or a combination of the two, which varies from design to design. To learn more, visit our Guide to Precious Metals.