Looks like your everyday average ring - either silver or silver-plated. Check the inner side of the ring for a jewelery hallmark - it will provide more information about the exact alloy it is made of. Knowing that and the weight will help you establish how much it's worth, although I wouldn't be too excited about it - silver jewelery is relatively inexpensive. If it has no markings, it's practically a worhless trinket.
The location mark (if any) will obviously differ since these are English marks and you're not UK-Based, check for Canadian ones if you're interested. The Silver Standards symbols apply though.