What does it mean when the inside of the ring has a star stamped and ss 995?

The stamp "ss 995" indicates that the ring is made of sterling silver with a purity of 99.5%, which is higher than the standard sterling silver (92.5% silver). The presence of a star may signify the manufacturer's logo or a mark of authenticity. Such high-purity silver is often softer and more malleable than standard sterling, making it more prone to scratching but also giving it a bright, lustrous appearance. Always ensure to verify the authenticity of the stamps with a reputable source if you're unsure.