PLEASE NOTE: It finished in vintage-ish gold color rather than shiny gold. It is NOT made from real gold. The material is gold plated titanium Q&A 1. What size should I choose? - Based on most of the reviews and my personal experience, it is running half size smaller compared to some US fashion brands like Madewell. The size measurement chart is accurate. Size 6 is about 16.5mm in inner diameter. Feel free to measure your finger and pick the correct size. 2. What is the material? - It is made from 18K real gold plated titanium. Titanium is nickel-free, zinc-free and hyperallergic. 3. Does the color tarnish? - This material is water-resistant. It's guaranteed to last for at least a year. Even it starts to tarnish after a year or two, it will look a bit darker like vintage gold. It won't turn your finger green. To keep the color lasting longer, I would avoid wearing it to shower or washing hands or swimming. --------------------------------------------------------------- Follow us on Instagram @theshapesstudios Check out our online store: https://shapesstudionyc.com