Using a jeweler to prove an item is real gold?

[FreeLitres]

I'm trying to sell a 9 ct gold item at the moment but I don't have a sales receipt to prove value/authenticity. The item is hallmarked etc.

Would a jeweler be able to perform a test to prove the chain is real gold in front of the prospective buyer? If so, how much would the jeweler charge? Would they issue some kind of certificate?

Anyone done anything similar?

[FreeLitres]

Yes it is hallmarked but the buyer wants reassurance that its genuine.

[FreeLitres]

Jimboka said:

Damn, is Google broken again?

Google just gives me links for gold testing kits or full valuations from some jewelers.

I still don't know if they can just do a test to prove its real and how much that might cost.