Shipping insurance companies

Does anyone have info. on independent insurance of items shipped via
UPS, FedEx., etc.? FedEx won’t insure precious materials over
$500.00 ( so their rep. told me) and the insurance through UPS is
astronomical.

I am not a member of JBT so I can’t avail myself of any services
that they offer. Thanks in advance for any help.

Andy Cooperman