The Loss Management Group (LMG), which handles 30,000 jewellery claims a year on behalf of insurers, has published a guide to buying, insuring and keeping safe jewellery for consumers.
The booklet covers a wide variety of issues, including buying items overseas, protecting against burglary and what to look out for when buying gems.
It also gives advice on insuring jewellery and outlines what people should do if their valuables are lost or stolen.
Managing director Tony LeFevre said: "Policyholders are always asking us for advice on jewellery, so we thought it was time to publish our own guide. We hope it will take some of the mystery out of buying jewellery and encourage people to protect it from burglary or loss."