Authentication

Hi Can anyone tell me how to go about authenticating a Paurure
accompanied by a letter saying that is was gotton from a Colonol Wortley
who got it from someone that was connected to Marie Antonette; (can’t
spell) I told believe anything until I get find some concrete facts to go
with the Someone these pieces wound up with an economically
poor person who engraved her name on it, which makes it even harder to
take seriously, but I would like to make the attempt as the dates on the
letters are right and who knows?? Sincerely Chris
http://www.tace.com/glitters