CoLife Jewelry guarantee the gemstone is natural gemstone and the metal is real 925 silver If you receive fake jewelry from us, we will give you 10 times payment back. Metal: Solid 925 Silver Metal Surface Treatment: Platinum Plating Gemstone Name: Natural Tourmaline Gemstone Size: 4 mm * 6 mm Gemstone Weight: 0.4 ct Gemstone Grade or Color: Green Gemstone Origin: Brazil Gemstone Treatment: Heat Gemstone Cut: Oval Cut Ring Size: from 4 to 12, USA standard Customized: Yes Gemstone Certificate: GIC certificate ( Certificate is not free, please search GIC in our shop and pay the certificate with jewelry.) CoLife Jewelry Want to Tell You: Your satisfaction is our goal, please give us 5 stars feedback if you like our jewelry. 1. Don't receive the parcel, we will send new parcel or give your payment back. 2. Jewelry have any problems, we will send new jewelry or give your payment back. 3. Don't like the jewelry in 14 days, send it back to us we will give your payment back. 4. Any questions and requests, please send message to me.