shipping insurance jewelry

How insurance works when shipping jewelry?
I'm selling a diamond ring for my mother on eBay, and she says it must be assured before it is sent to wherever. How it works How to be sure, and we have to return the money when it reaches its destination safely? The ring is a value nearly $ 2000.
Are the ring with UPS shipping? The post office? O? The post office sells insurance on the item being shipped. I do not know if the other companies do or not. Including the subject can not get your money. You paid for insurance and service. Check with the post office to see how much insurance costs.
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