The cost of protecting yourself against loss or theft depends on several factors—including the value of your ring, of course, as well as where you live (major city dwellers will pay more). According to Donna Syverson, a spokeswoman for the national insurance firm Jewelers Mutual, your annual premium will be about 1 to 2.7 percent of the jewelry's appraised value, even for rings that cost six figures.

5.21-carat emerald-cut diamond and brilliant-cut round diamond accents in platinum, Van Cleef & Arpels, price upon request; 800-822-5797.