What does ABR 900 mean on jewelry?

ABR 900 on jewelry typically indicates that the piece is made from 90% silver, with the remaining 10% made up of other metals. The "ABR" stands for "Alleged British Standard," and this marking suggests that the jewelry meets certain quality standards for silver content. It's important to verify the authenticity of such markings, as they can vary by country and manufacturer. Always consider consulting a professional if you're unsure about the quality of your jewelry.