The burden of proof is on the company to prove it is counterfeit since they are bringing the allegation. These companies do this sort of thing for a living in policing trademarks for counterfeit items. They do so in looking at the photos in the hopes of intimidating people to pay them. However, if your item is the real thing, and you really should go to a jeweler with the item to have it inspected and get a report from the jeweler that it is authentic and send them a copy of that report with a letter telling them that you made it as a legitimate purchase from the antique market and give the location and tell them you were selling it under the right of resale and as such you do not owe them anything nor do they have any proof the item is a fake.
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