Anyone ever sell gold/diamonds?

Anyone ever sell gold/diamonds?

I came across my old wedding set in a box. (Old as in from my previous and unlamented marriage.) It's not a huge thing- a slim gold band and a solitaire engagement ring with a 1/2 carat diamond. Has anyone here successfully turned such items into cash? Any recommendations of companies to try or to be wary of or tips on how to go about selling would be much appreciated. I know there are places that will send you a mailer to send your stuff to them but I'm hesitant to just mail off a diamond to a company with no references.
Daughter’s New Room

Daughter’s New Room

my grandfathers garden

my grandfathers garden

Corkscrew Parsnips

Corkscrew Parsnips

serviceberry

serviceberry

New Houseplants

New Houseplants

looking through the archives is so inspirational!

looking through the archives is so inspirational!