Not sure what the others are on about here but you should insure your ring seperately if it is valuable. There aren't many specialist insurers in this area but when I was researching this last year one name kept cropping up, generally regarded as THE place to insure with. Even the jewellers say so. I pay around £54 per year to insure my partners ring which is worth nearly £2,000, which I think is very good value. It covers overseas travel as well but you have to let them know when you're going.
Get a quote from them and put your mind at rest. The company is called T H March www.thmarch.co.uk. They are very nice people and they don't mess about.