From a jewelry insurance policy:

Perils Excluded

“We” do not pay for a loss if one or more of the following excluded perils apply to the loss, regardless of other causes or events that contribute to or aggravate the loss, whether such causes or events act to produce the loss before, at the same time as or after the excluded peril.

….

d. The discharge of a nuclear weapon even if it is accidental.

[Because when the nuclear armageddon comes, and all of my worldly possessions—and cough, PROBABLY MYSELF, cough—have melted in the fiery holocaust of the atomic bomb, my main worry in life is going to be, “How can I get a new engagement ring?”]